diff --git a/alchemy_cms.gemspec b/alchemy_cms.gemspec
index 6fb80bd84e..70b3a73ab7 100644
--- a/alchemy_cms.gemspec
+++ b/alchemy_cms.gemspec
@@ -46,7 +46,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'capybara',                     ['~> 3.0']
   gem.add_development_dependency 'capybara-screenshot',          ['~> 1.0']
   gem.add_development_dependency 'factory_bot_rails',            ['~> 6.0']
-  gem.add_development_dependency 'puma',                         ['~> 4.0']
+  gem.add_development_dependency 'puma',                         ['~> 5.0']
   gem.add_development_dependency 'rails-controller-testing',     ['~> 1.0']
   gem.add_development_dependency 'rspec-activemodel-mocks',      ['~> 1.0']
   gem.add_development_dependency 'rspec-rails',                  ['>= 4.0.0.beta2']