diff --git a/substrate/Cargo.lock b/substrate/Cargo.lock
index 452da42fb6..9dd2198b81 100644
--- a/substrate/Cargo.lock
+++ b/substrate/Cargo.lock
@@ -1047,6 +1047,15 @@ dependencies = [
  "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hex-literal"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "hex-literal-impl 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hex-literal-impl"
 version = "0.1.2"
@@ -1055,6 +1064,14 @@ dependencies = [
  "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "hex-literal-impl"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro-hack 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "hmac"
 version = "0.4.2"
@@ -1967,7 +1984,7 @@ version = "1.0.0"
 dependencies = [
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "node-executor 1.0.0",
  "node-primitives 1.0.0",
@@ -2038,7 +2055,6 @@ dependencies = [
 name = "node-runtime"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "integer-sqrt 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "node-primitives 1.0.0",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2081,7 +2097,6 @@ dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "exit-future 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "node-template-runtime 1.0.0",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3223,7 +3238,6 @@ dependencies = [
 name = "srml-assets"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3238,7 +3252,6 @@ dependencies = [
 name = "srml-aura"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3260,7 +3273,6 @@ dependencies = [
 name = "srml-balances"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3277,7 +3289,6 @@ dependencies = [
 name = "srml-consensus"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3294,7 +3305,7 @@ name = "srml-contract"
 version = "1.0.0"
 dependencies = [
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-wasm 0.31.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "pwasm-utils 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3317,7 +3328,7 @@ dependencies = [
 name = "srml-council"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3335,7 +3346,6 @@ dependencies = [
 name = "srml-democracy"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3352,7 +3362,6 @@ dependencies = [
 name = "srml-example"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3367,7 +3376,7 @@ dependencies = [
 name = "srml-executive"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3384,7 +3393,6 @@ dependencies = [
 name = "srml-finality-tracker"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3420,7 +3428,6 @@ dependencies = [
 name = "srml-indices"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "ref_thread_local 0.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3448,7 +3455,6 @@ dependencies = [
 name = "srml-session"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3467,7 +3473,6 @@ dependencies = [
 name = "srml-staking"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3488,7 +3493,6 @@ dependencies = [
 name = "srml-sudo"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3505,7 +3509,6 @@ name = "srml-support"
 version = "1.0.0"
 dependencies = [
  "bitmask 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "once_cell 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "paste 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3568,7 +3571,6 @@ name = "srml-system"
 version = "1.0.0"
 dependencies = [
  "criterion 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "safe-mix 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -3583,7 +3585,6 @@ dependencies = [
 name = "srml-timestamp"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3599,7 +3600,6 @@ dependencies = [
 name = "srml-treasury"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.90 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-io 1.0.0",
@@ -3731,7 +3731,7 @@ version = "1.0.0"
 dependencies = [
  "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "node-primitives 1.0.0",
  "node-runtime 1.0.0",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4036,7 +4036,7 @@ dependencies = [
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libsecp256k1 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4107,7 +4107,6 @@ dependencies = [
 name = "substrate-keyring"
 version = "1.0.0"
 dependencies = [
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "sr-primitives 1.0.0",
  "strum 0.14.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4245,7 +4244,7 @@ dependencies = [
  "hash256-std-hasher 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "impl-serde 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4273,7 +4272,6 @@ dependencies = [
  "assert_matches 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-core 10.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-derive 10.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "jsonrpc-pubsub 10.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4387,7 +4385,7 @@ version = "1.0.0"
 dependencies = [
  "hash-db 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4437,7 +4435,6 @@ name = "substrate-test-runtime"
 version = "1.0.0"
 dependencies = [
  "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory-db 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4501,7 +4498,7 @@ version = "1.0.0"
 dependencies = [
  "criterion 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "keccak-hasher 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "memory-db 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 3.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -5506,7 +5503,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
 "checksum hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "ddc2928beef125e519d69ae1baa8c37ea2e0d3848545217f6db0179c5eb1d639"
+"checksum hex-literal 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c3da68162fdd2147e66682e78e729bd77f93b4c99656db058c5782d8c6b6225a"
 "checksum hex-literal-impl 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "520870c3213943eb8d7803e80180d12a6c7ceb4ae74602544529d1643dc4ddda"
+"checksum hex-literal-impl 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "06095d08c7c05760f11a071b3e1d4c5b723761c01bd8d7201c30a9536668a612"
 "checksum hmac 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7a13f4163aa0c5ca1be584aace0e2212b2e41be5478218d4f657f5f778b2ae2a"
 "checksum hmac 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f127a908633569f208325f86f71255d3363c79721d7f9fe31cd5569908819771"
 "checksum hmac-drbg 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4fe727d41d2eec0a6574d887914347e5ff96a3b87177817e2a9820c5c87fecc2"
diff --git a/substrate/core/executor/Cargo.toml b/substrate/core/executor/Cargo.toml
index 0278c1704d..d56fb00ad9 100644
--- a/substrate/core/executor/Cargo.toml
+++ b/substrate/core/executor/Cargo.toml
@@ -25,7 +25,7 @@ tiny-keccak = "1.4.2"
 [dev-dependencies]
 assert_matches = "1.1"
 wabt = "~0.7.4"
-hex-literal = "0.1.0"
+hex-literal = "0.2.0"
 
 [features]
 default = []
diff --git a/substrate/core/executor/src/wasm_executor.rs b/substrate/core/executor/src/wasm_executor.rs
index cc355f6bba..3fe1a1c3cc 100644
--- a/substrate/core/executor/src/wasm_executor.rs
+++ b/substrate/core/executor/src/wasm_executor.rs
@@ -897,7 +897,7 @@ mod tests {
 	use parity_codec::Encode;
 
 	use state_machine::TestExternalities;
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use primitives::map;
 
 	#[test]
diff --git a/substrate/core/keyring/Cargo.toml b/substrate/core/keyring/Cargo.toml
index 74f898b83f..01fa362cad 100644
--- a/substrate/core/keyring/Cargo.toml
+++ b/substrate/core/keyring/Cargo.toml
@@ -7,7 +7,6 @@ edition = "2018"
 [dependencies]
 substrate-primitives = { path = "../primitives" }
 sr-primitives = { path = "../sr-primitives" }
-hex-literal = { version = "0.1.0" }
 lazy_static = { version = "1.0" }
 strum = "0.14.0"
 strum_macros = "0.14.0"
diff --git a/substrate/core/primitives/Cargo.toml b/substrate/core/primitives/Cargo.toml
index 02133e0655..6d50c8be0e 100644
--- a/substrate/core/primitives/Cargo.toml
+++ b/substrate/core/primitives/Cargo.toml
@@ -18,7 +18,6 @@ hash-db = { version = "0.12", default-features = false }
 hash256-std-hasher = { version = "0.12", default-features = false }
 ring = { version = "0.14", optional = true }
 untrusted = { version = "0.6", optional = true }
-hex-literal = { version = "0.1", optional = true }
 base58 = { version = "0.1", optional = true }
 blake2-rfc = { version = "0.2.18", optional = true }
 schnorrkel = { version = "0.1", optional = true }
@@ -33,7 +32,7 @@ regex = {version = "1.1", optional = true }
 substrate-serializer = { path = "../serializer" }
 pretty_assertions = "0.6"
 heapsize = "0.4"
-hex-literal = "0.1"
+hex-literal = "0.2"
 rand = "0.6"
 
 [features]
@@ -57,7 +56,6 @@ std = [
 	"blake2-rfc",
 	"ring",
 	"untrusted",
-	"hex-literal",
 	"hex",
 	"base58",
 	"substrate-bip39",
diff --git a/substrate/core/primitives/benches/benches.rs b/substrate/core/primitives/benches/benches.rs
index b81ef9dc42..a38f5fdae2 100644
--- a/substrate/core/primitives/benches/benches.rs
+++ b/substrate/core/primitives/benches/benches.rs
@@ -16,10 +16,9 @@
 #![feature(test)]
 
 extern crate test;
-use hex_literal::{hex, hex_impl};
+use hex_literal::hex;
 use substrate_primitives::hashing::{twox_128, blake2_128};
 
-
 const MAX_KEY_SIZE: u32 = 32;
 
 fn data_set() -> Vec<Vec<u8>> {
diff --git a/substrate/core/primitives/src/crypto.rs b/substrate/core/primitives/src/crypto.rs
index dc886c7b38..dce30fad71 100644
--- a/substrate/core/primitives/src/crypto.rs
+++ b/substrate/core/primitives/src/crypto.rs
@@ -410,7 +410,7 @@ pub trait Pair: Sized {
 #[cfg(test)]
 mod tests {
 	use crate::DeriveJunction;
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use super::*;
 
 	#[derive(Eq, PartialEq, Debug)]
diff --git a/substrate/core/primitives/src/ed25519.rs b/substrate/core/primitives/src/ed25519.rs
index d095c6445d..8bf3ae4ad0 100644
--- a/substrate/core/primitives/src/ed25519.rs
+++ b/substrate/core/primitives/src/ed25519.rs
@@ -490,7 +490,7 @@ impl Pair {
 #[cfg(test)]
 mod test {
 	use super::*;
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use crate::crypto::DEV_PHRASE;
 
 	#[test]
diff --git a/substrate/core/primitives/src/sr25519.rs b/substrate/core/primitives/src/sr25519.rs
index e70e35c1ae..8f309ec030 100644
--- a/substrate/core/primitives/src/sr25519.rs
+++ b/substrate/core/primitives/src/sr25519.rs
@@ -504,7 +504,7 @@ impl Pair {
 mod test {
 	use super::*;
 	use crate::crypto::{Ss58Codec, DEV_PHRASE, DEV_ADDRESS};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn default_phrase_should_be_used() {
diff --git a/substrate/core/rpc/Cargo.toml b/substrate/core/rpc/Cargo.toml
index 600cd9ac48..4b00f2bf2d 100644
--- a/substrate/core/rpc/Cargo.toml
+++ b/substrate/core/rpc/Cargo.toml
@@ -32,4 +32,3 @@ test_client = { package = "substrate-test-client", path = "../test-client" }
 test_runtime = { package = "substrate-test-runtime", path = "../test-runtime" }
 consensus = { package = "substrate-consensus-common", path = "../consensus/common" }
 rustc-hex = "2.0"
-hex-literal = "0.1"
diff --git a/substrate/core/sr-primitives/src/lib.rs b/substrate/core/sr-primitives/src/lib.rs
index e1ec698a4a..08c6b3c9a9 100644
--- a/substrate/core/sr-primitives/src/lib.rs
+++ b/substrate/core/sr-primitives/src/lib.rs
@@ -33,9 +33,6 @@ use rstd::prelude::*;
 use substrate_primitives::{crypto, ed25519, sr25519, hash::{H256, H512}};
 use codec::{Encode, Decode};
 
-#[cfg(feature = "std")]
-use substrate_primitives::hexdisplay::ascii_format;
-
 #[cfg(feature = "std")]
 pub mod testing;
 
diff --git a/substrate/core/state-machine/Cargo.toml b/substrate/core/state-machine/Cargo.toml
index eed53d49c3..171ae15b28 100644
--- a/substrate/core/state-machine/Cargo.toml
+++ b/substrate/core/state-machine/Cargo.toml
@@ -6,7 +6,6 @@ description = "Substrate State Machine"
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 log = "0.4"
 parking_lot = "0.7.1"
 heapsize = "0.4"
@@ -17,3 +16,6 @@ trie = { package = "substrate-trie", path = "../trie" }
 primitives = { package = "substrate-primitives", path = "../primitives" }
 panic-handler = { package = "substrate-panic-handler", path = "../panic-handler" }
 parity-codec = "3.3"
+
+[dev-dependencies]
+hex-literal = "0.2.0"
diff --git a/substrate/core/state-machine/src/basic.rs b/substrate/core/state-machine/src/basic.rs
index 0c95de61cb..a4863485b7 100644
--- a/substrate/core/state-machine/src/basic.rs
+++ b/substrate/core/state-machine/src/basic.rs
@@ -166,7 +166,7 @@ impl<H: Hasher> Externalities<H> for BasicExternalities where H::Out: Ord + Heap
 mod tests {
 	use super::*;
 	use primitives::{Blake2Hasher, H256};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn commit_should_work() {
diff --git a/substrate/core/state-machine/src/ext.rs b/substrate/core/state-machine/src/ext.rs
index c88798f37f..a9f2ab9d0e 100644
--- a/substrate/core/state-machine/src/ext.rs
+++ b/substrate/core/state-machine/src/ext.rs
@@ -360,7 +360,7 @@ where
 
 #[cfg(test)]
 mod tests {
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use parity_codec::Encode;
 	use primitives::{Blake2Hasher};
 	use primitives::storage::well_known_keys::EXTRINSIC_INDEX;
diff --git a/substrate/core/state-machine/src/overlayed_changes.rs b/substrate/core/state-machine/src/overlayed_changes.rs
index 56e69323e8..c98882726e 100644
--- a/substrate/core/state-machine/src/overlayed_changes.rs
+++ b/substrate/core/state-machine/src/overlayed_changes.rs
@@ -309,7 +309,7 @@ impl From<Option<Vec<u8>>> for OverlayedValue {
 
 #[cfg(test)]
 mod tests {
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 	use primitives::{Blake2Hasher, H256};
 	use primitives::storage::well_known_keys::EXTRINSIC_INDEX;
 	use crate::backend::InMemory;
diff --git a/substrate/core/state-machine/src/testing.rs b/substrate/core/state-machine/src/testing.rs
index ac096c0c3e..3adf277bf3 100644
--- a/substrate/core/state-machine/src/testing.rs
+++ b/substrate/core/state-machine/src/testing.rs
@@ -180,7 +180,7 @@ impl<H: Hasher> Externalities<H> for TestExternalities<H> where H::Out: Ord + He
 mod tests {
 	use super::*;
 	use primitives::{Blake2Hasher, H256};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn commit_should_work() {
diff --git a/substrate/core/test-runtime/Cargo.toml b/substrate/core/test-runtime/Cargo.toml
index 2a4540090e..6b3d6f7d9f 100644
--- a/substrate/core/test-runtime/Cargo.toml
+++ b/substrate/core/test-runtime/Cargo.toml
@@ -6,7 +6,6 @@ edition = "2018"
 
 [dependencies]
 log = { version = "0.4", optional = true }
-hex-literal = { version = "0.1.0", optional = true }
 serde = { version = "1.0", optional = true, features = ["derive"] }
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
 keyring = { package = "substrate-keyring", path = "../keyring", optional = true }
@@ -35,7 +34,6 @@ substrate-test-client = { path = "../test-client" }
 default = ["std"]
 std = [
 	"log",
-	"hex-literal",
 	"serde",
 	"substrate-client/std",
 	"keyring",
diff --git a/substrate/core/trie/Cargo.toml b/substrate/core/trie/Cargo.toml
index 1fd1b7b3bd..b47148c28d 100644
--- a/substrate/core/trie/Cargo.toml
+++ b/substrate/core/trie/Cargo.toml
@@ -25,7 +25,7 @@ trie-bench = { version = "0.12" }
 trie-standardmap = { version = "0.12" }
 keccak-hasher = { version = "0.12" }
 criterion = "0.2"
-hex-literal = "0.1.0"
+hex-literal = "0.2.0"
 
 [features]
 default = ["std"]
diff --git a/substrate/core/trie/src/lib.rs b/substrate/core/trie/src/lib.rs
index a9a9860f94..e29402b63c 100644
--- a/substrate/core/trie/src/lib.rs
+++ b/substrate/core/trie/src/lib.rs
@@ -339,7 +339,7 @@ mod tests {
 	use hash_db::{HashDB, Hasher};
 	use trie_db::{DBValue, TrieMut, Trie};
 	use trie_standardmap::{Alphabet, ValueMode, StandardMap};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	fn check_equivalent(input: &Vec<(&[u8], &[u8])>) {
 		{
diff --git a/substrate/node-template/Cargo.toml b/substrate/node-template/Cargo.toml
index 7ef20cc89f..3e9d8656ea 100644
--- a/substrate/node-template/Cargo.toml
+++ b/substrate/node-template/Cargo.toml
@@ -17,7 +17,6 @@ log = "0.4"
 tokio = "0.1"
 exit-future = "0.1"
 parking_lot = "0.7.1"
-hex-literal = "0.1"
 parity-codec = "3.3"
 trie-root = "0.12.2"
 sr-io = { path = "../core/sr-io" }
diff --git a/substrate/node/cli/Cargo.toml b/substrate/node/cli/Cargo.toml
index a26d8f3ae8..0ca5dc34f6 100644
--- a/substrate/node/cli/Cargo.toml
+++ b/substrate/node/cli/Cargo.toml
@@ -19,7 +19,7 @@ primitives = { package = "substrate-primitives", path = "../../core/primitives"
 inherents = { package = "substrate-inherents", path = "../../core/inherents" }
 node-runtime = { path = "../runtime" }
 node-primitives = { path = "../primitives" }
-hex-literal = "0.1"
+hex-literal = "0.2"
 substrate-basic-authorship = { path = "../../core/basic-authorship" }
 substrate-service = { path = "../../core/service" }
 transaction_pool = { package = "substrate-transaction-pool", path = "../../core/transaction-pool" }
diff --git a/substrate/node/cli/src/chain_spec.rs b/substrate/node/cli/src/chain_spec.rs
index b09d55c6e9..0c017d2fac 100644
--- a/substrate/node/cli/src/chain_spec.rs
+++ b/substrate/node/cli/src/chain_spec.rs
@@ -23,7 +23,7 @@ use node_runtime::{ConsensusConfig, CouncilSeatsConfig, CouncilVotingConfig, Dem
 	SudoConfig, ContractConfig, GrandpaConfig, IndicesConfig, Permill, Perbill};
 pub use node_runtime::GenesisConfig;
 use substrate_service;
-use hex_literal::{hex, hex_impl};
+use hex_literal::hex;
 use substrate_telemetry::TelemetryEndpoints;
 
 const STAGING_TELEMETRY_URL: &str = "wss://telemetry.polkadot.io/submit/";
diff --git a/substrate/node/runtime/Cargo.toml b/substrate/node/runtime/Cargo.toml
index f8e0e047bc..d6d5207747 100644
--- a/substrate/node/runtime/Cargo.toml
+++ b/substrate/node/runtime/Cargo.toml
@@ -34,7 +34,6 @@ sudo = { package = "srml-sudo", path = "../../srml/sudo", default-features = fal
 node-primitives = { path = "../primitives", default-features = false }
 consensus_aura = { package = "substrate-consensus-aura-primitives", path = "../../core/consensus/aura/primitives", default-features = false }
 rustc-hex = { version = "2.0", optional = true }
-hex-literal = { version = "0.1.0", optional = true }
 serde = { version = "1.0", optional = true }
 substrate-keyring = { path = "../../core/keyring", optional = true }
 consensus_authorities = { package = "substrate-consensus-authorities", path = "../../core/consensus/authorities", default-features = false }
@@ -73,7 +72,6 @@ std = [
 	"client/std",
 	"consensus_aura/std",
 	"rustc-hex",
-	"hex-literal",
 	"substrate-keyring",
 	"offchain-primitives/std",
 	"consensus_authorities/std",
diff --git a/substrate/srml/assets/Cargo.toml b/substrate/srml/assets/Cargo.toml
index 066dd42ffd..726c7f3580 100644
--- a/substrate/srml/assets/Cargo.toml
+++ b/substrate/srml/assets/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 parity-codec = { version = "3.3", default-features = false }
 # Needed for various traits. In our case, `OnFinalize`.
diff --git a/substrate/srml/aura/Cargo.toml b/substrate/srml/aura/Cargo.toml
index b22fea8ffd..4ec1c27c71 100644
--- a/substrate/srml/aura/Cargo.toml
+++ b/substrate/srml/aura/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
 serde = { version = "1.0", optional = true }
 inherents = { package = "substrate-inherents", path = "../../core/inherents", default-features = false }
diff --git a/substrate/srml/balances/Cargo.toml b/substrate/srml/balances/Cargo.toml
index 804ee60364..df8c31c865 100644
--- a/substrate/srml/balances/Cargo.toml
+++ b/substrate/srml/balances/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 safe-mix = { version = "1.0", default-features = false}
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
diff --git a/substrate/srml/consensus/Cargo.toml b/substrate/srml/consensus/Cargo.toml
index ef3e943c8d..267e394ffb 100644
--- a/substrate/srml/consensus/Cargo.toml
+++ b/substrate/srml/consensus/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true, features = ["derive"] }
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
 substrate-primitives = { path = "../../core/primitives", default-features = false }
diff --git a/substrate/srml/contract/Cargo.toml b/substrate/srml/contract/Cargo.toml
index 28ca8f9eb9..6d302c208c 100644
--- a/substrate/srml/contract/Cargo.toml
+++ b/substrate/srml/contract/Cargo.toml
@@ -22,7 +22,7 @@ timestamp = { package = "srml-timestamp", path = "../timestamp", default-feature
 [dev-dependencies]
 wabt = "~0.7.4"
 assert_matches = "1.1"
-hex-literal = "0.1.0"
+hex-literal = "0.2.0"
 consensus = { package = "srml-consensus", path = "../consensus" }
 balances = { package = "srml-balances", path = "../balances" }
 
diff --git a/substrate/srml/contract/src/tests.rs b/substrate/srml/contract/src/tests.rs
index d6fa2677df..0e7270769c 100644
--- a/substrate/srml/contract/src/tests.rs
+++ b/substrate/srml/contract/src/tests.rs
@@ -29,7 +29,7 @@ use srml_support::{storage::child, StorageMap, assert_ok, impl_outer_event, impl
 use substrate_primitives::Blake2Hasher;
 use system::{self, Phase, EventRecord};
 use {wabt, balances, consensus};
-use hex_literal::*;
+use hex_literal::hex;
 use assert_matches::assert_matches;
 use crate::{
 	ContractAddressFor, GenesisConfig, Module, RawEvent,
diff --git a/substrate/srml/council/Cargo.toml b/substrate/srml/council/Cargo.toml
index 87de0ae0d1..c4d535af53 100644
--- a/substrate/srml/council/Cargo.toml
+++ b/substrate/srml/council/Cargo.toml
@@ -17,7 +17,7 @@ democracy = { package = "srml-democracy", path = "../democracy", default-feature
 system = { package = "srml-system", path = "../system", default-features = false }
 
 [dev-dependencies]
-hex-literal = "0.1.0"
+hex-literal = "0.2.0"
 balances = { package = "srml-balances", path = "../balances" }
 
 [features]
diff --git a/substrate/srml/council/src/motions.rs b/substrate/srml/council/src/motions.rs
index 3bbe463780..393ebce4f8 100644
--- a/substrate/srml/council/src/motions.rs
+++ b/substrate/srml/council/src/motions.rs
@@ -205,7 +205,7 @@ mod tests {
 	use crate::tests::{Call, Origin, Event as OuterEvent};
 	use srml_support::{Hashable, assert_ok, assert_noop};
 	use system::{EventRecord, Phase};
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	#[test]
 	fn motions_basic_environment_works() {
diff --git a/substrate/srml/democracy/Cargo.toml b/substrate/srml/democracy/Cargo.toml
index e789c733d6..8fbe34bb2e 100644
--- a/substrate/srml/democracy/Cargo.toml
+++ b/substrate/srml/democracy/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true, features = ["derive"] }
 safe-mix = { version = "1.0", default-features = false}
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
diff --git a/substrate/srml/example/Cargo.toml b/substrate/srml/example/Cargo.toml
index c62b61f7b3..ae9f2f508e 100644
--- a/substrate/srml/example/Cargo.toml
+++ b/substrate/srml/example/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 parity-codec = { version = "3.3", default-features = false }
 srml-support = { path = "../support", default-features = false }
diff --git a/substrate/srml/executive/Cargo.toml b/substrate/srml/executive/Cargo.toml
index 0526e86ca9..ef2190da54 100644
--- a/substrate/srml/executive/Cargo.toml
+++ b/substrate/srml/executive/Cargo.toml
@@ -14,7 +14,7 @@ srml-support = { path = "../support", default-features = false }
 system = { package = "srml-system", path = "../system", default-features = false }
 
 [dev-dependencies]
-hex-literal = "0.1.0"
+hex-literal = "0.2.0"
 substrate-primitives = { path = "../../core/primitives" }
 srml-indices = { path = "../indices" }
 balances = { package = "srml-balances", path = "../balances" }
diff --git a/substrate/srml/executive/src/lib.rs b/substrate/srml/executive/src/lib.rs
index 271d7156ac..6ca10bed2d 100644
--- a/substrate/srml/executive/src/lib.rs
+++ b/substrate/srml/executive/src/lib.rs
@@ -365,7 +365,7 @@ mod tests {
 	use primitives::testing::{Digest, DigestItem, Header, Block};
 	use srml_support::{traits::Currency, impl_outer_origin, impl_outer_event};
 	use system;
-	use hex_literal::{hex, hex_impl};
+	use hex_literal::hex;
 
 	impl_outer_origin! {
 		pub enum Origin for Runtime {
diff --git a/substrate/srml/finality-tracker/Cargo.toml b/substrate/srml/finality-tracker/Cargo.toml
index c85534f1eb..b0b2c53b58 100644
--- a/substrate/srml/finality-tracker/Cargo.toml
+++ b/substrate/srml/finality-tracker/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", default-features = false, features = ["derive"] }
 parity-codec = { version = "3.3", default-features = false }
 inherents = { package = "substrate-inherents", path = "../../core/inherents", default-features = false }
diff --git a/substrate/srml/indices/Cargo.toml b/substrate/srml/indices/Cargo.toml
index 8c62cf13b5..ad666e7a54 100644
--- a/substrate/srml/indices/Cargo.toml
+++ b/substrate/srml/indices/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 safe-mix = { version = "1.0", default-features = false}
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
diff --git a/substrate/srml/session/Cargo.toml b/substrate/srml/session/Cargo.toml
index 036f5a55ec..7739e9746f 100644
--- a/substrate/srml/session/Cargo.toml
+++ b/substrate/srml/session/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition =  "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 safe-mix = { version = "1.0", default-features = false}
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
diff --git a/substrate/srml/staking/Cargo.toml b/substrate/srml/staking/Cargo.toml
index cd10f783b1..e26814ffde 100644
--- a/substrate/srml/staking/Cargo.toml
+++ b/substrate/srml/staking/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 safe-mix = { version = "1.0", default-features = false}
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
diff --git a/substrate/srml/sudo/Cargo.toml b/substrate/srml/sudo/Cargo.toml
index 220127ba3b..788d24e1c3 100644
--- a/substrate/srml/sudo/Cargo.toml
+++ b/substrate/srml/sudo/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
 sr-std = { path = "../../core/sr-std", default-features = false }
diff --git a/substrate/srml/support/Cargo.toml b/substrate/srml/support/Cargo.toml
index ab16e98ee9..1d44412be7 100644
--- a/substrate/srml/support/Cargo.toml
+++ b/substrate/srml/support/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = { version = "0.1.0", optional = true }
 serde = { version = "1.0", optional = true, features = ["derive"] }
 codec = { package = "parity-codec", version = "3.5.1", default-features = false, features = ["derive"] }
 srml-metadata = { path = "../metadata", default-features = false }
@@ -25,7 +24,6 @@ srml-system = { path = "../system", default-features = false }
 [features]
 default = ["std"]
 std = [
-	"hex-literal",
 	"once_cell",
 	"bitmask/std",
 	"serde",
diff --git a/substrate/srml/system/Cargo.toml b/substrate/srml/system/Cargo.toml
index 0effeae251..0153906c97 100644
--- a/substrate/srml/system/Cargo.toml
+++ b/substrate/srml/system/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true, features = ["derive"] }
 safe-mix = { version = "1.0", default-features = false}
 parity-codec = { version = "3.5", default-features = false, features = ["derive"] }
diff --git a/substrate/srml/timestamp/Cargo.toml b/substrate/srml/timestamp/Cargo.toml
index c86493890a..b785dd9184 100644
--- a/substrate/srml/timestamp/Cargo.toml
+++ b/substrate/srml/timestamp/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true }
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
 rstd = { package = "sr-std", path = "../../core/sr-std", default-features = false }
diff --git a/substrate/srml/treasury/Cargo.toml b/substrate/srml/treasury/Cargo.toml
index a4f3960edd..e0716f6c59 100644
--- a/substrate/srml/treasury/Cargo.toml
+++ b/substrate/srml/treasury/Cargo.toml
@@ -5,7 +5,6 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.0"
 serde = { version = "1.0", optional = true, features = ["derive"] }
 parity-codec = { version = "3.3", default-features = false, features = ["derive"] }
 rstd = { package = "sr-std", path = "../../core/sr-std", default-features = false }
diff --git a/substrate/subkey/Cargo.toml b/substrate/subkey/Cargo.toml
index 280f18887e..bd44c8754a 100644
--- a/substrate/subkey/Cargo.toml
+++ b/substrate/subkey/Cargo.toml
@@ -16,7 +16,7 @@ rustc-hex = "2.0"
 substrate-bip39 = { git = "https://github.com/paritytech/substrate-bip39" }
 schnorrkel = "0.1"
 hex = "0.3"
-hex-literal = "0.1"
+hex-literal = "0.2"
 parity-codec = "3.2"
 
 [features]
diff --git a/substrate/subkey/src/main.rs b/substrate/subkey/src/main.rs
index 2aa8609623..b0ad1b281d 100644
--- a/substrate/subkey/src/main.rs
+++ b/substrate/subkey/src/main.rs
@@ -18,11 +18,8 @@
 #[cfg(feature = "bench")]
 extern crate test;
 
-extern crate substrate_bip39;
-extern crate rustc_hex;
-#[macro_use] extern crate hex_literal;
-
 use std::io::{stdin, Read};
+use hex_literal::hex;
 use clap::load_yaml;
 use rand::{RngCore, rngs::OsRng};
 use substrate_bip39::mini_secret_from_entropy;