diff --git a/Gemfile.lock b/Gemfile.lock
index 182a315..5c3590a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -99,7 +99,7 @@ GEM
     multi_json (1.8.4)
     polyglot (0.3.4)
     racc (1.4.10)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-protection (1.5.2)
       rack
     rack-test (0.6.2)