diff --git a/Cargo.lock b/Cargo.lock
index 987f9712d..7a05581dd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -416,7 +416,7 @@ dependencies = [
  "ff 0.12.0",
  "generic-array",
  "group 0.12.0",
- "hex-literal 0.3.4",
+ "hex-literal",
  "hkdf 0.12.3",
  "pem-rfc7468 0.6.0",
  "pkcs8 0.9.0",
@@ -536,31 +536,12 @@ dependencies = [
  "stable_deref_trait",
 ]
 
-[[package]]
-name = "hex-literal"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d70693199b3cf4552f3fa720b54163927a3ebed2aef240efaf556033ab336a11"
-dependencies = [
- "hex-literal-impl",
- "proc-macro-hack",
-]
-
 [[package]]
 name = "hex-literal"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ebdb29d2ea9ed0083cd8cece49bbd968021bd99b0849edb4a9a7ee0fdf6a4e0"
 
-[[package]]
-name = "hex-literal-impl"
-version = "0.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59448fc2f82a5fb6907f78c3d69d843e82ff5b051923313cc4438cb0c7b745a8"
-dependencies = [
- "proc-macro-hack",
-]
-
 [[package]]
 name = "hkdf"
 version = "0.11.0"
@@ -817,12 +798,6 @@ version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97e91cb6af081c6daad5fa705f8adb0634c027662052cb3174bdf2957bf07e25"
 
-[[package]]
-name = "proc-macro-hack"
-version = "0.5.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5"
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.38"
@@ -1009,7 +984,7 @@ name = "signature"
 version = "1.6.0-pre"
 dependencies = [
  "digest 0.10.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "hex-literal 0.2.2",
+ "hex-literal",
  "rand_core 0.6.3",
  "sha2 0.10.2",
  "signature_derive",
diff --git a/signature/Cargo.toml b/signature/Cargo.toml
index d3c805274..8895dce0e 100644
--- a/signature/Cargo.toml
+++ b/signature/Cargo.toml
@@ -18,7 +18,7 @@ rand_core = { version = "0.6", optional = true, default-features = false }
 signature_derive = { version = "=1.0.0-pre.5", optional = true, path = "derive" }
 
 [dev-dependencies]
-hex-literal = "0.2.2"
+hex-literal = "0.3"
 sha2 = { version = "0.10", default-features = false }
 
 [features]