diff --git a/tarpc/Cargo.toml b/tarpc/Cargo.toml
index 5e2f046..661f442 100644
--- a/tarpc/Cargo.toml
+++ b/tarpc/Cargo.toml
@@ -11,10 +11,12 @@ readme = "README.md"
 description = "An RPC framework for Rust with a focus on ease of use."
 
 [dependencies]
-bincode = "*"
-env_logger = "*"
-lazy_static = "*"
-log = "*"
-scoped-pool = "*"
-serde = "*"
-serde_macros = "*"
+bincode = "^0.4.0"
+log = "^0.3.5"
+scoped-pool = "^0.1.4"
+serde = "^0.6.11"
+serde_macros = "^0.6.11"
+
+[dev-dependencies]
+lazy_static = "^0.1.15"
+env_logger = "^0.3.2"