diff --git a/parity-crypto/Cargo.toml b/parity-crypto/Cargo.toml
index 291d29371..5a7ea3b9b 100644
--- a/parity-crypto/Cargo.toml
+++ b/parity-crypto/Cargo.toml
@@ -30,6 +30,7 @@ pbkdf2 = "0.3.0"
 subtle = "2.2.1"
 zeroize = { version = "1.0.0", default-features = false }
 rand = "0.7.2"
+rustc-hex = "2.0"
 
 [dev-dependencies]
 criterion = "0.3.0"