diff --git a/Gemfile.lock b/Gemfile.lock
index d85cb11..c922122 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -91,7 +91,7 @@ GEM
     polyglot (0.3.3)
     powder (0.1.8)
       thor (>= 0.11.5)
-    rack (1.4.1)
+    rack (1.4.7)
     rack-cache (1.2)
       rack (>= 0.4)
     rack-ssl (1.3.2)