diff --git a/Gemfile.lock b/Gemfile.lock
index ff51ca4..349c744 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -58,7 +58,7 @@ GEM
       cocaine (~> 0.5.0)
       mime-types
     polyglot (0.3.3)
-    rack (1.5.2)
+    rack (1.5.5)
     rack-test (0.6.2)
       rack (>= 1.0)
     rails (4.0.0)