diff --git a/Gemfile b/Gemfile
index 2a811fe..95e26e3 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source "https://rubygems.org"
 ruby "2.0.0"
 
 gem "sinatra", "~> 1.4.4", :require => "sinatra/base"
-gem "rack", "~> 1.5.2"
+gem "rack", "~> 1.6.13"
 gem "rake", "~> 10.1.0"
 
 group :development, :test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 57b63e0..8defe12 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
       debugger-ruby_core_source (~> 1.2.3)
     debugger-linecache (1.2.0)
     debugger-ruby_core_source (1.2.3)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.5.1)
       rack
     rack-test (0.6.2)
@@ -25,7 +25,7 @@ PLATFORMS
 
 DEPENDENCIES
   debugger (~> 1.6.2)
-  rack (~> 1.5.2)
+  rack (~> 1.6.13)
   rack-test (~> 0.6.2)
   rake (~> 10.1.0)
   sinatra (~> 1.4.4)