diff --git a/omniauth.gemspec b/omniauth.gemspec
index 640d2be..16e325b 100644
--- a/omniauth.gemspec
+++ b/omniauth.gemspec
@@ -6,7 +6,7 @@ require 'omniauth/version'
 
 Gem::Specification.new do |spec|
   spec.add_dependency 'hashie', ['>= 3.4.6']
-  spec.add_dependency 'rack', '~> 2.2.3'
+  spec.add_dependency 'rack', '>= 2.2.3'
   spec.add_development_dependency 'bundler', '~> 2.0'
   spec.add_dependency 'rack-protection'
   spec.add_development_dependency 'rake', '~> 12.0'