diff --git a/Gemfile.lock b/Gemfile.lock
index 34a18e1..138af34 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -125,7 +125,7 @@ GEM
     polyamorous (1.2.0)
       activerecord (>= 3.0)
     polyglot (0.3.5)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.0.2)