diff --git a/Gemfile b/Gemfile
index d07065c..56ff453 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,5 +7,5 @@ group :development do
   gem 'pry'
   gem 'rb-readline'
   gem 'rake'
-  gem 'rack', '~> 2.0.6'
+  gem 'rack', '~> 2.1.4'
 end