diff --git a/Cargo.toml b/Cargo.toml
index 6fe1f10..787e8e6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,5 +14,5 @@ rational, and complex types.
 """
 
 [dependencies]
-rustc-serialize = "0.2"
-rand = "0.1"
+rustc-serialize = "0.3.5"
+rand = "0.2.0"