diff --git a/Gemfile.lock b/Gemfile.lock
index 4a2dfc8..11cf811 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -55,7 +55,7 @@ GEM
     multi_json (1.3.6)
     nokogiri (1.5.5)
     polyglot (0.3.3)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)