diff --git a/Gemfile b/Gemfile
index 0ef1cf1..4ad1253 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,4 +2,4 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem 'rack', RUBY_VERSION < '2.2.2' ? '~> 1.6' : '>= 2.0'
+gem 'rack', '>= 2.0'