diff --git a/Cargo.toml b/Cargo.toml
index 17195c460e..7353922415 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,7 @@ httparse = "1.0"
 language-tags = "0.2"
 log = "0.3"
 mime = "0.2"
-num_cpus = "0.2"
+num_cpus = "1.0"
 rustc-serialize = "0.3"
 time = "0.1"
 traitobject = "0.0.1"