diff --git a/ethcontract/Cargo.toml b/ethcontract/Cargo.toml
index 6d8af8c4..c2115cf4 100644
--- a/ethcontract/Cargo.toml
+++ b/ethcontract/Cargo.toml
@@ -53,5 +53,5 @@ web3 = { version = "0.18", default-features = false, features = ["signing"] }
 zeroize = "1.1"
 
 [dev-dependencies]
-hex-literal = "0.3"
+hex-literal = "0.4"
 tokio = { version = "1.6", features = ["macros"] }