diff --git a/Gemfile b/Gemfile
index f378954..c2ccf6d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 group :development do
   gem 'rake', '~> 0.9'
-  gem 'rack', '~> 1.4.1'
+  gem 'rack', '~> 1.6.13'
   gem 'jekyll', '~> 0.12'
   gem 'rdiscount', '~> 1.6.8'
   gem 'pygments.rb', '~> 0.3.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index c235b2c..2aeb4ec 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
     pygments.rb (0.3.4)
       posix-spawn (~> 0.3.6)
       yajl-ruby (~> 1.1.0)
-    rack (1.4.1)
+    rack (1.6.13)
     rack-protection (1.3.2)
       rack
     rake (0.9.2.2)
@@ -55,7 +55,7 @@ DEPENDENCIES
   jekyll (~> 0.12)
   liquid (~> 2.3.0)
   pygments.rb (~> 0.3.4)
-  rack (~> 1.4.1)
+  rack (~> 1.6.13)
   rake (~> 0.9)
   rb-fsevent (~> 0.9)
   rdiscount (~> 1.6.8)