diff --git a/Gemfile.lock b/Gemfile.lock
index b2c49dc..ec8b5bb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -20,7 +20,7 @@ GEM
     multi_json (1.9.2)
     nokogiri (1.6.1)
       mini_portile (~> 0.5.0)
-    rack (1.5.2)
+    rack (2.2.3)
     rack-test (0.6.2)
       rack (>= 1.0)
     rspec (2.14.1)