diff --git a/Gemfile.lock b/Gemfile.lock
index d6878461397..138b512e800 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -116,7 +116,7 @@ GEM
     pygments.rb (0.6.3)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.2.0)
-    rack (1.6.4)
+    rack (1.6.13)
     rack-jekyll (0.4.5)
       jekyll (>= 1.3)
       listen (>= 1.3)