diff --git a/Cargo.lock b/Cargo.lock
index 6fcd6982e0115..4a985f432f872 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1176,15 +1176,6 @@ name = "hex"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "hex-literal"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "hex-literal-impl 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "hex-literal"
 version = "0.2.0"
@@ -1194,14 +1185,6 @@ dependencies = [
  "proc-macro-hack 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "hex-literal-impl"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-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"
@@ -2832,14 +2815,6 @@ dependencies = [
  "toml 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "proc-macro-hack"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "proc-macro-hack-impl 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "proc-macro-hack"
 version = "0.5.8"
@@ -2850,11 +2825,6 @@ dependencies = [
  "syn 0.15.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "proc-macro-hack-impl"
-version = "0.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "proc-macro2"
 version = "0.4.30"
@@ -3690,7 +3660,7 @@ dependencies = [
 name = "srml-babe"
 version = "2.0.0"
 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)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parity-codec 4.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4235,7 +4205,7 @@ dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-preview 0.3.0-alpha.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "hash-db 0.14.0 (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)",
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=b0317f649ab2c665b7987b8475878fc4d2e1f81d)",
  "kvdb-memorydb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=b0317f649ab2c665b7987b8475878fc4d2e1f81d)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -6046,9 +6016,7 @@ dependencies = [
 "checksum heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1679e6ea370dee694f91f1dc469bf94cf8f52051d147aec3e1f9497c6fc22461"
 "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"
@@ -6184,9 +6152,7 @@ dependencies = [
 "checksum pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
 "checksum primitive-types 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "366ef730e56c11fd21ab3e518866cf7feb0fdf7f7c16ddc68485579e9d802787"
 "checksum proc-macro-crate 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "e10d4b51f154c8a7fb96fd6dad097cb74b863943ec010ac94b9fd1be8861fe1e"
-"checksum proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2c725b36c99df7af7bf9324e9c999b9e37d92c8f8caf106d82e1d7953218d2d8"
 "checksum proc-macro-hack 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)" = "982a35d1194084ba319d65c4a68d24ca28f5fdb5b8bc20899e4eef8641ea5178"
-"checksum proc-macro-hack-impl 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2b753ad9ed99dd8efeaa7d2fb8453c8f6bc3e54b97966d35f1bc77ca6865254a"
 "checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 "checksum protobuf 2.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5f00e4a3cb64ecfeac2c0a73c74c68ae3439d7a6bead3870be56ad5dd2620a6f"
 "checksum pwasm-utils 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "efb0dcbddbb600f47a7098d33762a00552c671992171637f5bb310b37fe1f0e4"
diff --git a/core/client/Cargo.toml b/core/client/Cargo.toml
index 29951b5c48492..f140b2f343f74 100644
--- a/core/client/Cargo.toml
+++ b/core/client/Cargo.toml
@@ -9,7 +9,7 @@ derive_more = { version = "0.14.0", optional = true }
 fnv = { version = "1.0", optional = true }
 log = { version = "0.4", optional = true }
 parking_lot = { version = "0.8.0", optional = true }
-hex = { package = "hex-literal", version = "0.1", optional = true }
+hex = { package = "hex-literal", version = "0.2", optional = true }
 futures-preview = { version = "0.3.0-alpha.17", optional = true }
 consensus = { package = "substrate-consensus-common", path = "../consensus/common", optional = true }
 executor = { package = "substrate-executor", path = "../executor", optional = true }
diff --git a/srml/babe/Cargo.toml b/srml/babe/Cargo.toml
index afa46370cd0c7..ae33886d68c41 100644
--- a/srml/babe/Cargo.toml
+++ b/srml/babe/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["Parity Technologies <admin@parity.io>"]
 edition = "2018"
 
 [dependencies]
-hex-literal = "0.1.4"
+hex-literal = "0.2.0"
 parity-codec = { version = "4.1.1", default-features = false, features = ["derive"] }
 serde = { version = "1.0.93", optional = true }
 inherents = { package = "substrate-inherents", path = "../../core/inherents", default-features = false }
diff --git a/test-utils/chain-spec-builder/Cargo.lock b/test-utils/chain-spec-builder/Cargo.lock
index afa92a46f8f4d..5442a47bd5db1 100644
--- a/test-utils/chain-spec-builder/Cargo.lock
+++ b/test-utils/chain-spec-builder/Cargo.lock
@@ -994,15 +994,6 @@ name = "hex"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "hex-literal"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "hex-literal-impl 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro-hack 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "hex-literal"
 version = "0.2.0"
@@ -1012,14 +1003,6 @@ dependencies = [
  "proc-macro-hack 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "hex-literal-impl"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-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"
@@ -3503,7 +3486,7 @@ dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.26 (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)",
  "kvdb 0.1.0 (git+https://github.com/paritytech/parity-common?rev=b0317f649ab2c665b7987b8475878fc4d2e1f81d)",
  "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)",
@@ -4909,9 +4892,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum heapsize 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1679e6ea370dee694f91f1dc469bf94cf8f52051d147aec3e1f9497c6fc22461"
 "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 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "733e1b3ac906631ca01ebb577e9bb0f5e37a454032b9036b5eaea4013ed6f99a"