diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 6fcc146b70..e7ea1a5239 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -1316,7 +1316,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "libp2p-core-derive 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libp2p-dns 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libp2p-floodsub 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1343,7 +1343,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-core"
-version = "0.3.3"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bs58 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1381,7 +1381,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-dns-unofficial 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1398,7 +1398,7 @@ dependencies = [
  "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 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1415,7 +1415,7 @@ dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1439,7 +1439,7 @@ dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "libp2p-identify 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libp2p-ping 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1464,7 +1464,7 @@ dependencies = [
  "data-encoding 2.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "dns-parser 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1485,7 +1485,7 @@ dependencies = [
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1501,7 +1501,7 @@ dependencies = [
  "curve25519-dalek 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "snow 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1516,7 +1516,7 @@ dependencies = [
  "arrayvec 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1533,7 +1533,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1544,7 +1544,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "aio-limited 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1563,7 +1563,7 @@ dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "hmac 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.6.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1583,7 +1583,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tk-listen 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1597,7 +1597,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1609,7 +1609,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-multiaddr 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rw-stream-sink 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1624,7 +1624,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
- "libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "yamux 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5061,7 +5061,7 @@ dependencies = [
 "checksum libc 0.2.48 (registry+https://github.com/rust-lang/crates.io-index)" = "e962c7641008ac010fa60a7dfdc1712449f29c44ef2d4702394aea943ee75047"
 "checksum libloading 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9c3ad660d7cb8c5822cd83d10897b0f1f1526792737a179e73896152f85b88c2"
 "checksum libp2p 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1cd53656209acc649a3aa4d9ce3580dd75d016317126fbdc6f8a8956f15f74de"
-"checksum libp2p-core 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "214b5c378d5cf045417bde07e3cba0ec1d7dece84639763a98f9c223c951f5c6"
+"checksum libp2p-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3bfdf7ab20e901f643cb0913e8e8feffd8439d3ee83d6cfea607f43fa3d14f6d"
 "checksum libp2p-core-derive 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "040ed14400a3640ef060734f5ac5f7b6691902d962f7a65a28a883db99be6092"
 "checksum libp2p-dns 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a822c32da15ab0c4451792a4b000c37fbf8e3bc5ac471632f0b1f13e8e555524"
 "checksum libp2p-floodsub 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4380fbc42ec03251c9e9a4656744e8e88bbe59cbf4e084fa66370ed0b868d085"