diff --git a/Gemfile.lock b/Gemfile.lock
index 6cdf38f..5048d93 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -81,7 +81,7 @@ GEM
     polyamorous (1.1.0)
       activerecord (>= 3.0)
     polyglot (0.3.5)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.0.1)