diff --git a/Gemfile b/Gemfile
index ff0dae3..b235cc3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source :gemcutter
 
-gem "rails", ">= 3.0.0rc"
+gem "rails", "~> 3.0.0rc"
 
 group :development do
   gem "jeweler", ">= 1.4.0"