diff --git a/Cargo.toml b/Cargo.toml
index 79d8f65..05a4a78 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -33,9 +33,9 @@ clap = {version = "2.5.1", features = ["yaml"]}
 glob = "0.2.11"
 maplit = "0.1.3"
 rayon = "0.3.1"
-rustc-serialize = "*"
-serde = "*"
-serde_cbor = "*"
-serde_json = "*"
-serde_yaml = "*"
+rustc-serialize = "0.3.19"
+serde = "0.7.5"
+serde_cbor = "0.3.3"
+serde_json = "0.7.0"
+serde_yaml = "0.2.4"
 walkdir = "0.1.5"