diff --git a/Gemfile.lock b/Gemfile.lock
index d357f68..54ffde1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,7 +45,7 @@ GEM
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     multi_json (1.3.6)
-    rack (1.4.1)
+    rack (1.6.13)
     rack-test (0.6.2)
       rack (>= 1.0)
     sass (3.2.1)