diff --git a/Gemfile.lock b/Gemfile.lock
index b6edcb0..39a23b6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
   remote: http://rubygems.org/
   specs:
     minitest (2.6.1)
-    rack (1.3.4)
+    rack (2.2.3)
     rack-test (0.6.1)
       rack (>= 1.0)
     tilt (1.3.3)