diff --git a/Gemfile.lock b/Gemfile.lock
index 79c9523..dbb00ca 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,7 +19,7 @@ GEM
       rdoc
     json (1.6.5)
     multi_json (1.1.0)
-    rack (1.4.1)
+    rack (2.2.3)
     rake (0.9.2.2)
     rdoc (3.12)
       json (~> 1.4)