diff --git a/Gemfile b/Gemfile
index 24fbae8..0e5468f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,7 +3,7 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in ey-core.gemspec
 gemspec
 
-gem "rack", "<= 2.1.4"
+gem "rack", ">= 2.1.4"
 
 group :doc do
   gem 'yard'