diff --git a/Gemfile b/Gemfile
index b4b18ba..d855e56 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem "rack",         "1.3.3"
+gem "rack",         "2.1.4"
 gem "rack-rewrite", "1.1.0"
 gem "rake",         "0.9.2"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index fb171b5..9c7d8a7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    rack (1.3.3)
+    rack (2.1.4)
     rack-rewrite (1.1.0)
     rake (0.9.2)
     shotgun (0.9)
@@ -11,7 +11,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rack (= 1.3.3)
+  rack (= 2.1.4)
   rack-rewrite (= 1.1.0)
   rake (= 0.9.2)
   shotgun