diff --git a/Gemfile.lock b/Gemfile.lock
index c3bc48a..e755f2d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -87,7 +87,7 @@ GEM
     nokogiri (1.5.5)
     pg (0.17.0)
     polyglot (0.3.3)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.0.0)