diff --git a/Gemfile.lock b/Gemfile.lock
index bc70e93..252ef4b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,7 +17,7 @@ GEM
       rdoc
     json (1.7.3)
     multi_json (1.3.5)
-    rack (1.4.1)
+    rack (2.1.4)
     rake (0.9.2.2)
     rdoc (3.12)
       json (~> 1.4)