diff --git a/Cargo.toml b/Cargo.toml
index 5b73d62..ccc7117 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,11 +18,11 @@ description = "A binary serialization / deserialization strategy that uses Serde
 
 [dependencies]
 byteorder = "1.2.0"
-serde = "^1.0.63"
+serde = "1.0.63"
 
 [dev-dependencies]
-serde_bytes = "^0.10.3"
-serde_derive = "^1.0.27"
+serde_bytes = "0.10.3"
+serde_derive = "1.0.27"
 
 [build-dependencies]
 autocfg = "0.1"