diff --git a/alchemy_cms.gemspec b/alchemy_cms.gemspec
index 564989321d..ff59de954b 100644
--- a/alchemy_cms.gemspec
+++ b/alchemy_cms.gemspec
@@ -65,7 +65,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency "simplecov", ["~> 0.20"]
   gem.add_development_dependency "selenium-webdriver", ["~> 4.10"]
   gem.add_development_dependency "webmock", ["~> 3.3"]
-  gem.add_development_dependency "shoulda-matchers", ["~> 5.0"]
+  gem.add_development_dependency "shoulda-matchers", ["~> 6.0"]
   gem.add_development_dependency "timecop", ["~> 0.9"]
 
   gem.post_install_message = <<~MSG