diff --git a/Gemfile.lock b/Gemfile.lock
index 6bed551d9..0c1995925 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,7 +31,7 @@ GEM
     nokogiri (1.5.2)
     polyglot (0.3.3)
     predicated (0.2.6)
-    rack (1.4.1)
+    rack (1.6.13)
     rack-codehighlighter (0.5.0)
       nokogiri (>= 1.4.1)
       rack (>= 1.0.0)