diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index b2bf3f6265..4124e32263 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -370,10 +370,10 @@ dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "js-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "kvdb-web 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-chain-spec 2.0.0",
  "sc-network 0.8.0",
  "sc-service 0.8.0",
@@ -447,7 +447,7 @@ dependencies = [
 
 [[package]]
 name = "bytes"
-version = "0.5.3"
+version = "0.5.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -510,7 +510,7 @@ version = "2.0.0"
 dependencies = [
  "ansi_term 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "node-cli 2.0.0",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-keystore 2.0.0",
  "sp-core 2.0.0",
  "structopt 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -608,7 +608,7 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -650,7 +650,7 @@ dependencies = [
  "cranelift-entity 0.50.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "target-lexicon 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "thiserror 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -684,7 +684,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cranelift-codegen 0.50.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "target-lexicon 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1025,8 +1025,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "clear_on_drop 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "curve25519-dalek 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1241,7 +1241,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1251,6 +1251,11 @@ name = "fixedbitset"
 version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "fixedbitset"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "flate2"
 version = "1.0.13"
@@ -1602,7 +1607,7 @@ name = "futures_codec"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1729,7 +1734,7 @@ dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "grafana-data-source 0.8.0",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1754,7 +1759,7 @@ name = "h2"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-sink 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1875,7 +1880,7 @@ name = "http"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "itoa 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1896,7 +1901,7 @@ name = "http-body"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1965,7 +1970,7 @@ name = "hyper"
 version = "0.13.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-channel 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-util 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2268,7 +2273,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "parity-bytes 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-util-mem 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2296,7 +2301,7 @@ dependencies = [
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rocksdb 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2349,48 +2354,48 @@ dependencies = [
 
 [[package]]
 name = "libp2p"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core-derive 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-deflate 0.6.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-dns 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-floodsub 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-identify 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-kad 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-mdns 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-mplex 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-noise 0.12.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-ping 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-plaintext 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-secio 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-swarm 0.4.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-tcp 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-uds 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-wasm-ext 0.7.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-websocket 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-yamux 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core-derive 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-deflate 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-dns 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-floodsub 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-gossipsub 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-identify 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-kad 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-mdns 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-mplex 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-noise 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-ping 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-plaintext 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-secio 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-tcp 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-uds 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-wasm-ext 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-websocket 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-yamux 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multihash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-core"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "asn1_der 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "bs58 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ed25519-dalek 1.0.0-pre.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2400,15 +2405,16 @@ dependencies = [
  "multistream-select 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multihash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "rw-stream-sink 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "thiserror 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2417,7 +2423,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-core-derive"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2426,79 +2432,101 @@ dependencies = [
 
 [[package]]
 name = "libp2p-deflate"
-version = "0.6.0-alpha.1"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "flate2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-dns"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-floodsub"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bs58 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "cuckoofilter 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-swarm 0.4.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "libp2p-identify"
-version = "0.14.0-alpha.1"
+name = "libp2p-gossipsub"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bs58 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-swarm 0.4.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-multiaddr 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lru 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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  "wasm-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "libp2p-identify"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "libp2p-kad"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "arrayvec 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-swarm 0.4.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-multiaddr 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multihash 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "uint 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2507,7 +2535,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-mdns"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "async-std 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2516,45 +2544,44 @@ dependencies = [
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-swarm 0.4.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-multiaddr 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-mplex"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-noise"
-version = "0.12.0-alpha.1"
+version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "curve25519-dalek 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "snow 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "x25519-dalek 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2563,31 +2590,30 @@ dependencies = [
 
 [[package]]
 name = "libp2p-ping"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-swarm 0.4.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-swarm 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "parity-multiaddr 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-plaintext"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rw-stream-sink 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2595,7 +2621,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-secio"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aes-ctr 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2604,18 +2630,19 @@ dependencies = [
  "hmac 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "js-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-send-wrapper 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "quicksink 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ring 0.16.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "rw-stream-sink 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "twofish 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "untrusted 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-futures 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "web-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2623,50 +2650,50 @@ dependencies = [
 
 [[package]]
 name = "libp2p-swarm"
-version = "0.4.0-alpha.1"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-timer 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-tcp"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "async-std 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "get_if_addrs 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ipnet 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-uds"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "async-std 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "libp2p-wasm-ext"
-version = "0.7.0-alpha.1"
+version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "js-sys 0.3.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-send-wrapper 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen 0.2.58 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-futures 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2674,14 +2701,14 @@ dependencies = [
 
 [[package]]
 name = "libp2p-websocket"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "async-tls 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "quicksink 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustls 0.16.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2694,13 +2721,13 @@ dependencies = [
 
 [[package]]
 name = "libp2p-yamux"
-version = "0.14.0-alpha.1"
+version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "thiserror 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "yamux 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2725,8 +2752,8 @@ dependencies = [
  "crunchy 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "digest 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hmac-drbg 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "subtle 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "typenum 1.11.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -2950,15 +2977,20 @@ name = "multimap"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "multimap"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "multistream-select"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -3035,7 +3067,7 @@ dependencies = [
  "pallet-timestamp 2.0.0",
  "pallet-transaction-payment 2.0.0",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-authority-discovery 0.8.0",
  "sc-basic-authorship 0.8.0",
  "sc-chain-spec 2.0.0",
@@ -4132,7 +4164,7 @@ dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha3 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -4143,10 +4175,10 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "blake2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha3 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "unsigned-varint 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -4198,7 +4230,7 @@ dependencies = [
  "impl-trait-for-tuples 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-util-mem-derive 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4288,7 +4320,7 @@ dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4349,6 +4381,15 @@ dependencies = [
  "fixedbitset 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "petgraph"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "fixedbitset 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "indexmap 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "pin-project"
 version = "0.4.6"
@@ -4493,7 +4534,7 @@ name = "prost"
 version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "prost-derive 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4514,6 +4555,23 @@ dependencies = [
  "which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "prost-build"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "multimap 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "petgraph 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost-types 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "which 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "prost-derive"
 version = "0.5.0"
@@ -4548,9 +4606,13 @@ dependencies = [
 ]
 
 [[package]]
-name = "protobuf"
-version = "2.8.1"
+name = "prost-types"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "pwasm-utils"
@@ -4574,7 +4636,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "env_logger 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4645,7 +4707,7 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.7.2"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "getrandom 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5018,13 +5080,13 @@ dependencies = [
  "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "prost-build 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "quickcheck 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-client-api 2.0.0",
  "sc-keystore 2.0.0",
  "sc-network 0.8.0",
@@ -5291,7 +5353,7 @@ dependencies = [
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pdqselect 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-block-builder 0.8.0",
  "sc-client 0.8.0",
  "sc-client-api 2.0.0",
@@ -5504,7 +5566,7 @@ dependencies = [
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-client 0.8.0",
  "sc-client-api 2.0.0",
  "sc-keystore 2.0.0",
@@ -5537,7 +5599,7 @@ dependencies = [
  "derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
  "sp-application-crypto 2.0.0",
  "sp-core 2.0.0",
@@ -5550,7 +5612,7 @@ name = "sc-network"
 version = "0.8.0"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "env_logger 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5560,7 +5622,7 @@ dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures_codec 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked-hash-map 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "linked_hash_set 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5568,7 +5630,7 @@ dependencies = [
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "quickcheck 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-block-builder 0.8.0",
  "sc-client 0.8.0",
@@ -5602,7 +5664,7 @@ dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "lru 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5618,10 +5680,10 @@ dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-block-builder 0.8.0",
  "sc-client 0.8.0",
  "sc-client-api 2.0.0",
@@ -5653,7 +5715,7 @@ dependencies = [
  "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-client-api 2.0.0",
  "sc-client-db 0.8.0",
  "sc-keystore 2.0.0",
@@ -5674,9 +5736,9 @@ name = "sc-peerset"
 version = "2.0.0"
 dependencies = [
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -5850,14 +5912,14 @@ dependencies = [
 name = "sc-telemetry"
 version = "2.0.0"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "slog 2.5.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "slog-json 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5940,7 +6002,7 @@ dependencies = [
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_os 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "subtle 2.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "zeroize 0.9.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -6079,7 +6141,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "sha2"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -6169,7 +6231,7 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.0.0"
+version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -6190,15 +6252,15 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "thiserror 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -6293,7 +6355,7 @@ dependencies = [
  "num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "primitive-types 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "sp-debug-derive 2.0.0",
  "sp-std 2.0.0",
@@ -6353,7 +6415,7 @@ dependencies = [
  "derive_more 0.99.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-timer 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p 0.14.0-alpha.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p 0.15.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -6428,13 +6490,13 @@ dependencies = [
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "primitive-types 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "schnorrkel 0.8.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "sp-debug-derive 2.0.0",
  "sp-externalities 0.8.0",
  "sp-runtime-interface 2.0.0",
@@ -6545,7 +6607,7 @@ dependencies = [
 name = "sp-phragmen"
 version = "2.0.0"
 dependencies = [
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "sp-io 2.0.0",
  "sp-runtime 2.0.0",
@@ -6570,7 +6632,7 @@ dependencies = [
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "paste 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
  "sp-application-crypto 2.0.0",
@@ -6684,7 +6746,7 @@ dependencies = [
  "num-traits 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "sp-core 2.0.0",
  "sp-externalities 0.8.0",
  "sp-panic-handler 2.0.0",
@@ -6882,7 +6944,7 @@ dependencies = [
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  "pallet-transaction-payment 2.0.0",
  "parity-scale-codec 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
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  "rustc-hex 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sc-rpc 2.0.0",
@@ -6900,7 +6962,7 @@ dependencies = [
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  "pbkdf2 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
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- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -7138,7 +7200,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
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  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -7227,7 +7289,7 @@ dependencies = [
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  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -7283,7 +7345,7 @@ name = "tokio"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
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  "num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -7504,7 +7566,7 @@ name = "tokio-util"
 version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
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  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -7584,7 +7646,7 @@ dependencies = [
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  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
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- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -7637,7 +7699,7 @@ name = "twox-hash"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -7690,7 +7752,7 @@ name = "unicode-normalization"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -7723,7 +7785,7 @@ name = "unsigned-varint"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -8008,7 +8070,7 @@ dependencies = [
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- "sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -8151,6 +8213,14 @@ dependencies = [
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 ]
 
+[[package]]
+name = "which"
+version = "3.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -8208,7 +8278,7 @@ dependencies = [
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- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -8243,12 +8313,12 @@ name = "yamux"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "bytes 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
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- "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "thiserror 1.0.9 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -8440,6 +8510,7 @@ dependencies = [
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@@ -8539,26 +8610,27 @@ dependencies = [
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 "checksum libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb5e43362e38e2bca2fd5f5134c4d4564a23a5c28e9b95411652021a8675ebe"
@@ -8587,6 +8659,7 @@ dependencies = [
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
 "checksum more-asserts 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0debeb9fcf88823ea64d64e4a815ab1643f33127d995978e099942ce38f25238"
 "checksum multimap 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2eb04b9f127583ed176e163fb9ec6f3e793b87e21deedd5734a69386a18a0151"
+"checksum multimap 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a97fbd5d00e0e37bfb10f433af8f5aaf631e739368dc9fc28286ca81ca4948dc"
 "checksum multistream-select 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f938ffe420493e77c8b6cbcc3f282283f68fc889c5dcbc8e51668d5f3a01ad94"
 "checksum names 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef320dab323286b50fb5cdda23f61c796a72a89998ab565ca32525c5c556f2da"
 "checksum native-tls 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "4b2df1a4c22fd44a62147fd8f13dd0f95c9d8ca7b2610299b2a2f9cf8964274e"
@@ -8637,6 +8710,7 @@ dependencies = [
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
 "checksum percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 "checksum petgraph 0.4.13 (registry+https://github.com/rust-lang/crates.io-index)" = "9c3659d1ee90221741f65dd128d9998311b0e40c5d3c23a62445938214abce4f"
+"checksum petgraph 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "29c127eea4a29ec6c85d153c59dc1213f33ec74cead30fe4730aecc88cc1fd92"
 "checksum pin-project 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "94b90146c7216e4cb534069fb91366de4ea0ea353105ee45ed297e2d1619e469"
 "checksum pin-project-internal 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "44ca92f893f0656d3cba8158dd0f2b99b94de256a4a54e870bd6922fcc6c8355"
 "checksum pin-project-lite 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f0af6cbca0e6e3ce8692ee19fb8d734b641899e07b68eb73e9bbbd32f1703991"
@@ -8656,10 +8730,11 @@ dependencies = [
 "checksum prost 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "96d14b1c185652833d24aaad41c5832b0be5616a590227c1fbff57c616754b23"
 "checksum prost 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "ce49aefe0a6144a45de32927c77bd2859a5f7677b55f220ae5b744e87389c212"
 "checksum prost-build 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "eb788126ea840817128183f8f603dce02cb7aea25c2a0b764359d8e20010702e"
+"checksum prost-build 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "02b10678c913ecbd69350e8535c3aef91a8676c0773fc1d7b95cdd196d7f2f26"
 "checksum prost-derive 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5e7dc378b94ac374644181a2247cebf59a6ec1c88b49ac77f3a94b86b79d0e11"
 "checksum prost-derive 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "537aa19b95acde10a12fec4301466386f757403de4cd4e5b4fa78fb5ecb18f72"
 "checksum prost-types 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1de482a366941c8d56d19b650fac09ca08508f2a696119ee7513ad590c8bac6f"
-"checksum protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "40361836defdd5871ff7e84096c6f6444af7fc157f8ef1789f54f147687caa20"
+"checksum prost-types 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1834f67c0697c001304b75be76f67add9c89742eda3a085ad8ee0bb38c3417aa"
 "checksum pwasm-utils 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4f7a12f176deee919f4ba55326ee17491c8b707d0987aed822682c821b660192"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quickcheck 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d5ca504a2fdaa08d3517f442fbbba91ac24d1ec4c51ea68688a038765e3b2662"
@@ -8669,7 +8744,7 @@ dependencies = [
 "checksum rand 0.3.23 (registry+https://github.com/rust-lang/crates.io-index)" = "64ac302d8f83c0c1974bf758f6b041c6c8ada916fbb44a609158ca8b064cc76c"
 "checksum rand 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)" = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
 "checksum rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6d71dacdc3c88c1fde3885a3be3fbab9f35724e6ce99467f7d9c5026132184ca"
-"checksum rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "3ae1b169243eaf61759b8475a998f0a385e42042370f3a7dbaf35246eacc8412"
+"checksum rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
 "checksum rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "556d3a1ca6600bfcbab7c7c91ccb085ac7fbbcd70e008a98742e7847f4f7bcef"
 "checksum rand_chacha 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "03a2a90da8c7523f554344f921aa97283eadf6ac484a6d2a7d0212fa7f8d6853"
 "checksum rand_core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
@@ -8730,7 +8805,7 @@ dependencies = [
 "checksum serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)" = "48c575e0cc52bdd09b47f330f646cf59afc586e9c4e3ccd6fc1f625b8ea1dad7"
 "checksum sha-1 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "23962131a91661d643c98940b20fcaffe62d776a823247be80a48fcb8b6fce68"
 "checksum sha1 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2579985fda508104f7587689507983eadd6a6e84dd35d6d115361f530916fa0d"
-"checksum sha2 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7b4d8bfd0e469f417657573d8451fb33d16cfe0989359b93baf3a1ffc639543d"
+"checksum sha2 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "27044adfd2e1f077f649f59deb9490d3941d674002f7d062870a60ebe9bd47a0"
 "checksum sha3 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "dd26bc0e7a2e3a7c959bc494caf58b72ee0c71d67704e9520f736ca7e4853ecf"
 "checksum shell32-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9ee04b46101f57121c9da2b151988283b6beb79b34f5bb29a58ee48cb695122c"
 "checksum shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
@@ -8740,7 +8815,7 @@ dependencies = [
 "checksum slog-scope 4.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7c44c89dd8b0ae4537d1ae318353eaf7840b4869c536e31c41e963d1ea523ee6"
 "checksum slog_derive 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a945ec7f7ce853e89ffa36be1e27dce9a43e82ff9093bf3461c30d5da74ed11b"
 "checksum smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
-"checksum smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ecf3b85f68e8abaa7555aa5abdb1153079387e60b718283d732f03897fcfc86"
+"checksum smallvec 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "44e59e0c9fa00817912ae6e4e6e3c4fe04455e75699d06eedc7d85917ed8e8f4"
 "checksum snow 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "afb767eee7d257ba202f0b9b08673bc13b22281632ef45267b19f13100accd2f"
 "checksum soketto 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3caa0ad6b765419f21e4cfa490ec7514a9fae4af986adef168a69477ba528671"
 "checksum sourcefile 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4bf77cb82ba8453b42b6ae1d692e4cdc92f9a47beaf89a847c8be83f4e328ad3"
@@ -8867,6 +8942,7 @@ dependencies = [
 "checksum websocket-base 0.24.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5e3810f0d00c4dccb54c30a4eee815e703232819dec7b007db115791c42aa374"
 "checksum weedle 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3bb43f70885151e629e2a19ce9e50bd730fd436cfd4b666894c9ce4de9141164"
 "checksum which 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b57acb10231b9493c8472b20cb57317d0679a49e0bdbee44b3b803a6473af164"
+"checksum which 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5475d47078209a02e60614f7ba5e645ef3ed60f771920ac1906d7c1cc65024c8"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/substrate/client/authority-discovery/Cargo.toml b/substrate/client/authority-discovery/Cargo.toml
index 25c3f161d4..6e4570a540 100644
--- a/substrate/client/authority-discovery/Cargo.toml
+++ b/substrate/client/authority-discovery/Cargo.toml
@@ -14,7 +14,7 @@ codec = { package = "parity-scale-codec", default-features = false, version = "1
 derive_more = "0.99.2"
 futures = "0.3.1"
 futures-timer = "2.0"
-libp2p = { version = "0.14.0-alpha.1", default-features = false, features = ["secp256k1", "libp2p-websocket"] }
+libp2p = { version = "0.15.0", default-features = false, features = ["secp256k1", "libp2p-websocket"] }
 log = "0.4.8"
 prost = "0.6.1"
 rand = "0.7.2"
diff --git a/substrate/client/network-gossip/Cargo.toml b/substrate/client/network-gossip/Cargo.toml
index 91c80e2213..82611bffc8 100644
--- a/substrate/client/network-gossip/Cargo.toml
+++ b/substrate/client/network-gossip/Cargo.toml
@@ -12,7 +12,7 @@ futures01 = { package = "futures", version = "0.1.29" }
 futures = { version = "0.3.1", features = ["compat"] }
 futures-timer = "0.4.0"
 lru = "0.1.2"
-libp2p = { version = "0.14.0-alpha.1", default-features = false, features = ["libp2p-websocket"] }
+libp2p = { version = "0.15.0", default-features = false, features = ["libp2p-websocket"] }
 sc-network = { version = "0.8", path = "../network" }
 parking_lot = "0.9.0"
 sp-runtime = { version = "2.0.0", path = "../../primitives/runtime" }
diff --git a/substrate/client/network/Cargo.toml b/substrate/client/network/Cargo.toml
index f1d89f71b0..7930087595 100644
--- a/substrate/client/network/Cargo.toml
+++ b/substrate/client/network/Cargo.toml
@@ -22,7 +22,7 @@ linked_hash_set = "0.1.3"
 lru = "0.4.0"
 rustc-hex = "2.0.1"
 rand = "0.7.2"
-libp2p = { version = "0.14.0-alpha.1", default-features = false, features = ["libp2p-websocket"] }
+libp2p = { version = "0.15.0", default-features = false, features = ["libp2p-websocket"] }
 fork-tree = { version = "2.0.0", path = "../../utils/fork-tree" }
 sp-consensus = { version = "0.8", path = "../../primitives/consensus/common" }
 sc-client = { version = "0.8", path = "../" }
diff --git a/substrate/client/network/src/config.rs b/substrate/client/network/src/config.rs
index 6a2062ddbf..6cf2587fe4 100644
--- a/substrate/client/network/src/config.rs
+++ b/substrate/client/network/src/config.rs
@@ -32,6 +32,7 @@ use libp2p::identity::{Keypair, ed25519};
 use libp2p::wasm_ext;
 use libp2p::{PeerId, Multiaddr, multiaddr};
 use core::{fmt, iter};
+use std::{future::Future, pin::Pin};
 use std::{error::Error, fs, io::{self, Write}, net::Ipv4Addr, path::{Path, PathBuf}, sync::Arc};
 use zeroize::Zeroize;
 
@@ -40,6 +41,10 @@ pub struct Params<B: BlockT, S, H: ExHashT> {
 	/// Assigned roles for our node (full, light, ...).
 	pub roles: Roles,
 
+	/// How to spawn background tasks. If you pass `None`, then a threads pool will be used by
+	/// default.
+	pub executor: Option<Box<dyn Fn(Pin<Box<dyn Future<Output = ()> + Send>>) + Send>>,
+
 	/// Network layer configuration.
 	pub network_config: NetworkConfiguration,
 
diff --git a/substrate/client/network/src/discovery.rs b/substrate/client/network/src/discovery.rs
index 11f687616e..531e769cce 100644
--- a/substrate/client/network/src/discovery.rs
+++ b/substrate/client/network/src/discovery.rs
@@ -122,7 +122,7 @@ impl<TSubstream> DiscoveryBehaviour<TSubstream> {
 			allow_private_ipv4,
 			#[cfg(not(target_os = "unknown"))]
 			mdns: if enable_mdns {
-				match Mdns::new().await {
+				match Mdns::new() {
 					Ok(mdns) => Some(mdns).into(),
 					Err(err) => {
 						warn!(target: "sub-libp2p", "Failed to initialize mDNS: {:?}", err);
diff --git a/substrate/client/network/src/protocol/legacy_proto/handler.rs b/substrate/client/network/src/protocol/legacy_proto/handler.rs
index f042d1b889..fc3b64b968 100644
--- a/substrate/client/network/src/protocol/legacy_proto/handler.rs
+++ b/substrate/client/network/src/protocol/legacy_proto/handler.rs
@@ -18,7 +18,7 @@ use super::upgrade::{RegisteredProtocol, RegisteredProtocolEvent, RegisteredProt
 use bytes::BytesMut;
 use futures::prelude::*;
 use futures_timer::Delay;
-use libp2p::core::{ConnectedPoint, PeerId, Endpoint};
+use libp2p::core::{ConnectedPoint, Negotiated, PeerId, Endpoint};
 use libp2p::core::upgrade::{InboundUpgrade, OutboundUpgrade};
 use libp2p::swarm::{
 	ProtocolsHandler, ProtocolsHandlerEvent,
@@ -159,7 +159,7 @@ enum ProtocolState<TSubstream> {
 	/// Waiting for the behaviour to tell the handler whether it is enabled or disabled.
 	Init {
 		/// List of substreams opened by the remote but that haven't been processed yet.
-		substreams: SmallVec<[RegisteredProtocolSubstream<TSubstream>; 6]>,
+		substreams: SmallVec<[RegisteredProtocolSubstream<Negotiated<TSubstream>>; 6]>,
 		/// Deadline after which the initialization is abnormally long.
 		init_deadline: Delay,
 	},
@@ -175,9 +175,9 @@ enum ProtocolState<TSubstream> {
 	/// If we are in this state, we have sent a `CustomProtocolOpen` message to the outside.
 	Normal {
 		/// The substreams where bidirectional communications happen.
-		substreams: SmallVec<[RegisteredProtocolSubstream<TSubstream>; 4]>,
+		substreams: SmallVec<[RegisteredProtocolSubstream<Negotiated<TSubstream>>; 4]>,
 		/// Contains substreams which are being shut down.
-		shutdown: SmallVec<[RegisteredProtocolSubstream<TSubstream>; 4]>,
+		shutdown: SmallVec<[RegisteredProtocolSubstream<Negotiated<TSubstream>>; 4]>,
 	},
 
 	/// We are disabled. Contains substreams that are being closed.
@@ -185,7 +185,7 @@ enum ProtocolState<TSubstream> {
 	/// outside or we have never sent any `CustomProtocolOpen` in the first place.
 	Disabled {
 		/// List of substreams to shut down.
-		shutdown: SmallVec<[RegisteredProtocolSubstream<TSubstream>; 6]>,
+		shutdown: SmallVec<[RegisteredProtocolSubstream<Negotiated<TSubstream>>; 6]>,
 
 		/// If true, we should reactivate the handler after all the substreams in `shutdown` have
 		/// been closed.
@@ -466,7 +466,7 @@ where
 	/// Called by `inject_fully_negotiated_inbound` and `inject_fully_negotiated_outbound`.
 	fn inject_fully_negotiated(
 		&mut self,
-		mut substream: RegisteredProtocolSubstream<TSubstream>
+		mut substream: RegisteredProtocolSubstream<Negotiated<TSubstream>>
 	) {
 		self.state = match mem::replace(&mut self.state, ProtocolState::Poisoned) {
 			ProtocolState::Poisoned => {
@@ -538,14 +538,14 @@ where TSubstream: AsyncRead + AsyncWrite + Unpin {
 
 	fn inject_fully_negotiated_inbound(
 		&mut self,
-		proto: <Self::InboundProtocol as InboundUpgrade<TSubstream>>::Output
+		proto: <Self::InboundProtocol as InboundUpgrade<Negotiated<TSubstream>>>::Output
 	) {
 		self.inject_fully_negotiated(proto);
 	}
 
 	fn inject_fully_negotiated_outbound(
 		&mut self,
-		proto: <Self::OutboundProtocol as OutboundUpgrade<TSubstream>>::Output,
+		proto: <Self::OutboundProtocol as OutboundUpgrade<Negotiated<TSubstream>>>::Output,
 		_: Self::OutboundOpenInfo
 	) {
 		self.inject_fully_negotiated(proto);
@@ -621,7 +621,7 @@ where
 /// Given a list of substreams, tries to shut them down. The substreams that have been successfully
 /// shut down are removed from the list.
 fn shutdown_list<TSubstream>
-	(list: &mut SmallVec<impl smallvec::Array<Item = RegisteredProtocolSubstream<TSubstream>>>,
+	(list: &mut SmallVec<impl smallvec::Array<Item = RegisteredProtocolSubstream<Negotiated<TSubstream>>>>,
 	cx: &mut Context)
 where TSubstream: AsyncRead + AsyncWrite + Unpin {
 	'outer: for n in (0..list.len()).rev() {
diff --git a/substrate/client/network/src/protocol/legacy_proto/upgrade.rs b/substrate/client/network/src/protocol/legacy_proto/upgrade.rs
index c021d5917f..311e0b04f9 100644
--- a/substrate/client/network/src/protocol/legacy_proto/upgrade.rs
+++ b/substrate/client/network/src/protocol/legacy_proto/upgrade.rs
@@ -18,7 +18,7 @@ use crate::config::ProtocolId;
 use bytes::BytesMut;
 use futures::prelude::*;
 use futures_codec::Framed;
-use libp2p::core::{Negotiated, Endpoint, UpgradeInfo, InboundUpgrade, OutboundUpgrade, upgrade::ProtocolName};
+use libp2p::core::{Endpoint, UpgradeInfo, InboundUpgrade, OutboundUpgrade, upgrade::ProtocolName};
 use std::{collections::VecDeque, io, pin::Pin, vec::IntoIter as VecIntoIter};
 use std::task::{Context, Poll};
 use unsigned_varint::codec::UviBytes;
@@ -82,7 +82,7 @@ pub struct RegisteredProtocolSubstream<TSubstream> {
 	/// If true, we should call `poll_complete` on the inner sink.
 	requires_poll_flush: bool,
 	/// The underlying substream.
-	inner: stream::Fuse<Framed<Negotiated<TSubstream>, UviBytes<BytesMut>>>,
+	inner: stream::Fuse<Framed<TSubstream, UviBytes<BytesMut>>>,
 	/// Version of the protocol that was negotiated.
 	protocol_version: u8,
 	/// If true, we have sent a "remote is clogged" event recently and shouldn't send another one
@@ -250,7 +250,7 @@ where TSubstream: AsyncRead + AsyncWrite + Unpin,
 
 	fn upgrade_inbound(
 		self,
-		socket: Negotiated<TSubstream>,
+		socket: TSubstream,
 		info: Self::Info,
 	) -> Self::Future {
 		let framed = {
@@ -280,7 +280,7 @@ where TSubstream: AsyncRead + AsyncWrite + Unpin,
 
 	fn upgrade_outbound(
 		self,
-		socket: Negotiated<TSubstream>,
+		socket: TSubstream,
 		info: Self::Info,
 	) -> Self::Future {
 		let framed = Framed::new(socket, UviBytes::default());
diff --git a/substrate/client/network/src/service.rs b/substrate/client/network/src/service.rs
index c6b6168126..e3eaf6c31d 100644
--- a/substrate/client/network/src/service.rs
+++ b/substrate/client/network/src/service.rs
@@ -36,7 +36,7 @@ use futures::{prelude::*, channel::mpsc};
 use log::{warn, error, info, trace};
 use libp2p::{PeerId, Multiaddr, kad::record};
 use libp2p::core::{transport::boxed::Boxed, muxing::StreamMuxerBox};
-use libp2p::swarm::{NetworkBehaviour, SwarmEvent};
+use libp2p::swarm::{NetworkBehaviour, SwarmBuilder, SwarmEvent};
 use parking_lot::Mutex;
 use sc_peerset::PeersetHandle;
 use sp_runtime::{traits::{Block as BlockT, NumberFor}, ConsensusEngineId};
@@ -213,7 +213,7 @@ impl<B: BlockT + 'static, S: NetworkSpecialization<B>, H: ExHashT> NetworkWorker
 		)?;
 
 		// Build the swarm.
-		let (mut swarm, bandwidth) = {
+		let (mut swarm, bandwidth): (Swarm::<B, S, H>, _) = {
 			let user_agent = format!(
 				"{} ({})",
 				params.network_config.client_version,
@@ -241,7 +241,11 @@ impl<B: BlockT + 'static, S: NetworkSpecialization<B>, H: ExHashT> NetworkWorker
 				};
 				transport::build_transport(local_identity, config_mem, config_wasm)
 			};
-			(Swarm::<B, S, H>::new(transport, behaviour, local_peer_id.clone()), bandwidth)
+			let mut builder = SwarmBuilder::new(transport, behaviour, local_peer_id.clone());
+			if let Some(spawner) = params.executor {
+				builder = builder.executor_fn(spawner);
+			}
+			(builder.build(), bandwidth)
 		};
 
 		// Listen on multiaddresses.
diff --git a/substrate/client/network/test/Cargo.toml b/substrate/client/network/test/Cargo.toml
index 036607df92..19590c2651 100644
--- a/substrate/client/network/test/Cargo.toml
+++ b/substrate/client/network/test/Cargo.toml
@@ -14,7 +14,7 @@ futures = "0.1.29"
 futures03 = { package = "futures", version = "0.3.1", features = ["compat"] }
 futures-timer = "0.4.0"
 rand = "0.7.2"
-libp2p = { version = "0.14.0-alpha.1", default-features = false, features = ["libp2p-websocket"] }
+libp2p = { version = "0.15.0", default-features = false, features = ["libp2p-websocket"] }
 sp-consensus = { version = "0.8", path = "../../../primitives/consensus/common" }
 sc-client = { version = "0.8", path = "../../" }
 sc-client-api = { version = "2.0.0", path = "../../api" }
diff --git a/substrate/client/network/test/src/lib.rs b/substrate/client/network/test/src/lib.rs
index 874c4d19f9..1e14ec7bb0 100644
--- a/substrate/client/network/test/src/lib.rs
+++ b/substrate/client/network/test/src/lib.rs
@@ -52,7 +52,7 @@ use sc_network::config::{NetworkConfiguration, TransportConfig, BoxFinalityProof
 use libp2p::PeerId;
 use parking_lot::Mutex;
 use sp_core::H256;
-use sc_network::{Context, ProtocolConfig};
+use sc_network::ProtocolConfig;
 use sp_runtime::generic::{BlockId, OpaqueDigestItemId};
 use sp_runtime::traits::{Block as BlockT, Header as HeaderT, NumberFor};
 use sp_runtime::Justification;
@@ -613,6 +613,7 @@ pub trait TestNetFactory: Sized {
 
 		let network = NetworkWorker::new(sc_network::config::Params {
 			roles: config.roles,
+			executor: None,
 			network_config: NetworkConfiguration {
 				listen_addresses: vec![listen_addr.clone()],
 				transport: TransportConfig::MemoryOnly,
@@ -688,6 +689,7 @@ pub trait TestNetFactory: Sized {
 
 		let network = NetworkWorker::new(sc_network::config::Params {
 			roles: config.roles,
+			executor: None,
 			network_config: NetworkConfiguration {
 				listen_addresses: vec![listen_addr.clone()],
 				transport: TransportConfig::MemoryOnly,
diff --git a/substrate/client/peerset/Cargo.toml b/substrate/client/peerset/Cargo.toml
index 90f44418c7..85c988d048 100644
--- a/substrate/client/peerset/Cargo.toml
+++ b/substrate/client/peerset/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 
 [dependencies]
 futures = "0.3.1"
-libp2p = { version = "0.14.0-alpha.1", default-features = false }
+libp2p = { version = "0.15.0", default-features = false }
 log = "0.4.8"
 serde_json = "1.0.41"
 
diff --git a/substrate/client/service/src/builder.rs b/substrate/client/service/src/builder.rs
index 202597e787..9b27a5b270 100644
--- a/substrate/client/service/src/builder.rs
+++ b/substrate/client/service/src/builder.rs
@@ -837,6 +837,14 @@ ServiceBuilder<
 
 		let network_params = sc_network::config::Params {
 			roles: config.roles,
+			executor: {
+				let to_spawn_tx = to_spawn_tx.clone();
+				Some(Box::new(move |fut| {
+					if let Err(e) = to_spawn_tx.unbounded_send(fut) {
+						error!("Failed to spawn libp2p background task: {:?}", e);
+					}
+				}))
+			},
 			network_config: config.network.clone(),
 			chain: client.clone(),
 			finality_proof_provider,
diff --git a/substrate/client/telemetry/Cargo.toml b/substrate/client/telemetry/Cargo.toml
index c536b7599b..dbcc486d17 100644
--- a/substrate/client/telemetry/Cargo.toml
+++ b/substrate/client/telemetry/Cargo.toml
@@ -10,7 +10,7 @@ bytes = "0.5"
 parking_lot = "0.9.0"
 futures = "0.3.1"
 futures-timer = "2.0.0"
-libp2p = { version = "0.14.0-alpha.1", default-features = false, features = ["libp2p-websocket"] }
+libp2p = { version = "0.15.0", default-features = false, features = ["libp2p-websocket"] }
 log = "0.4.8"
 pin-project = "0.4.6"
 rand = "0.7.2"
diff --git a/substrate/primitives/consensus/common/Cargo.toml b/substrate/primitives/consensus/common/Cargo.toml
index 8735416028..9321660871 100644
--- a/substrate/primitives/consensus/common/Cargo.toml
+++ b/substrate/primitives/consensus/common/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 
 [dependencies]
 derive_more = "0.99.2"
-libp2p = { version = "0.14.0-alpha.1", default-features = false }
+libp2p = { version = "0.15.0", default-features = false }
 log = "0.4.8"
 sp-core = { path= "../../core" }
 sp-inherents = { version = "2.0.0", path = "../../inherents" }
diff --git a/substrate/utils/browser/Cargo.toml b/substrate/utils/browser/Cargo.toml
index cfceaa143c..15ad771b45 100644
--- a/substrate/utils/browser/Cargo.toml
+++ b/substrate/utils/browser/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 futures = "0.3"
 futures01 = { package = "futures", version = "0.1.29" }
 log = "0.4.8"
-libp2p = { version = "0.14.0-alpha.1", default-features = false }
+libp2p = { version = "0.15.0", default-features = false }
 console_error_panic_hook = "0.1.6"
 console_log = "0.1.2"
 js-sys = "0.3.34"