diff --git a/idempotent-request.gemspec b/idempotent-request.gemspec
index d025400..69e18c2 100644
--- a/idempotent-request.gemspec
+++ b/idempotent-request.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'rack', '~> 2.0'
+  spec.add_dependency 'rack', '~> 3.0'
   spec.add_dependency 'oj', '~> 3.0'
 
   spec.add_development_dependency 'bundler'