diff --git a/wakey/Cargo.toml b/wakey/Cargo.toml
index 53cf755..c03800f 100644
--- a/wakey/Cargo.toml
+++ b/wakey/Cargo.toml
@@ -13,5 +13,5 @@ keywords = ["wol", "wake-on-lan"]
 categories = ["network-programming"]
 
 [dependencies]
-hex = "~0.3"
+hex = "~0.4"
 arrayvec = "0.7.2"