diff --git a/Cargo.toml b/Cargo.toml
index 027c609..8a0dc8c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,4 +13,4 @@ keywords = ["wol", "wake-on-lan"]
 categories = ["network-programming"]
 
 [dependencies]
-hex = "*"
+hex = "~0.3"