diff --git a/Gemfile.lock b/Gemfile.lock
index 0c0dc63..92bd288 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,7 +79,7 @@ GEM
     mysql2 (0.3.11)
     nokogiri (1.5.4)
     polyglot (0.3.3)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)