diff --git a/Gemfile b/Gemfile
index d6c399760b..ac7774cd66 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ group :development do
 
   # building extensions
   gem "rake-compiler", "1.2.5"
-  gem "rake-compiler-dock", "1.4.0.rc2"
+  gem "rake-compiler-dock", "1.4.0"
 
   # parser generator
   gem "rexical", "= 1.0.7"