diff --git a/bin/rubigen b/bin/rubigen
index 3557d21..5bcb780 100644
--- a/bin/rubigen
+++ b/bin/rubigen
@@ -4,7 +4,7 @@
 #  Copyright (c) 2008. All rights reserved.
 
 require "rubygems"
-gem 'activesupport', '2.3.5'
+gem 'activesupport', '~> 2.3.5'
 require File.expand_path(File.dirname(__FILE__) + "/../lib/rubigen")
 
 require "rubigen/cli"
diff --git a/lib/rubigen.rb b/lib/rubigen.rb
index 5fa157b..eaa2647 100644
--- a/lib/rubigen.rb
+++ b/lib/rubigen.rb
@@ -3,7 +3,7 @@
 
 begin
   # if you are using rubygems, fix to 2.3.5
-  gem 'activesupport', '2.3.5'
+  gem 'activesupport', '~> 2.3.5'
 rescue
 end