diff --git a/Gemfile b/Gemfile
index be2518b4..6a5b5fe9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "http://rubygems.org"
 
 group :development do
   gem 'rake', '~> 0.9.2'
-  gem 'rack', '~> 1.4.1'
+  gem 'rack', '~> 1.6.13'
   gem 'jekyll', '~> 0.11.2'
   gem 'rdiscount', '~> 1.6.8'
   gem 'pygments.rb', '~> 0.2.12'
diff --git a/Gemfile.lock b/Gemfile.lock
index 5060be1a..67cd5853 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -31,7 +31,7 @@ GEM
     posix-spawn (0.3.6)
     pygments.rb (0.2.13)
       rubypython (~> 0.5.3)
-    rack (1.4.1)
+    rack (1.6.13)
     rack-protection (1.2.0)
       rack
     rake (0.9.2.2)
@@ -60,7 +60,7 @@ DEPENDENCIES
   jekyll (~> 0.11.2)
   liquid (~> 2.3.0)
   pygments.rb (~> 0.2.12)
-  rack (~> 1.4.1)
+  rack (~> 1.6.13)
   rake (~> 0.9.2)
   rb-fsevent (~> 0.9)
   rdiscount (~> 1.6.8)