diff --git a/Cargo.lock b/Cargo.lock
index 4d86f3c44..62b1c107c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -168,22 +168,9 @@ dependencies = [
 
 [[package]]
 name = "hex-literal"
-version = "0.2.1"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "961de220ec9a91af2e1e5bd80d02109155695e516771762381ef8581317066e0"
-dependencies = [
- "hex-literal-impl",
- "proc-macro-hack",
-]
-
-[[package]]
-name = "hex-literal-impl"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9d4c5c844e2fee0bf673d54c2c177f1713b3d2af2ff6e666b49cb7572e6cf42d"
-dependencies = [
- "proc-macro-hack",
-]
+checksum = "5af1f635ef1bc545d78392b136bfe1c9809e029023c84a3638a864a10b8819c8"
 
 [[package]]
 name = "opaque-debug"
@@ -191,12 +178,6 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "624a8340c38c1b80fd549087862da4ba43e08858af025b236e509b6649fc13d5"
 
-[[package]]
-name = "proc-macro-hack"
-version = "0.5.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d659fe7c6d27f25e9d80a1a094c223f5246f6a6596453e09d7229bf42750b63"
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.12"
diff --git a/signature/Cargo.toml b/signature/Cargo.toml
index d365473ee..570e7d77f 100644
--- a/signature/Cargo.toml
+++ b/signature/Cargo.toml
@@ -27,7 +27,7 @@ optional = true
 path = "derive"
 
 [dev-dependencies]
-hex-literal = "0.2"
+hex-literal = "0.3"
 sha2 = { version = "0.9", default-features = false }
 
 [features]