diff --git a/Cargo.toml b/Cargo.toml
index 0d3ca72..ff27d48 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,8 +13,8 @@ description = "A binary serialization / deserialization strategy and implementat
 [dependencies]
 rustc-serialize = "0.3.*"
 byteorder = "0.4.*"
-num = "^0.1"
-serde = "^0.6"
+num = "0.1.*"
+serde = "0.6.*"
 
 [dev-dependencies]
 serde_macros = "*"