diff --git a/Gemfile b/Gemfile
index 3020708..da420e2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,7 +7,7 @@ git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 # gem "rails"
 source 'https://rubygems.org'
 gem 'nokogiri'
-gem 'rack', '~> 2.0.1'
+gem 'rack', '~> 2.2.3'
 gem 'rspec'