diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 206b75a..b4d3a68 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.7, 3.0, 3.1]
+        ruby: [2.7, 3.1, 3.3]
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
diff --git a/workflow.gemspec b/workflow.gemspec
index 247ecaf..240a546 100644
--- a/workflow.gemspec
+++ b/workflow.gemspec
@@ -28,11 +28,11 @@ Gem::Specification.new do |gem|
   ]
 
   gem.required_ruby_version = '>= 2.7'
-  gem.add_development_dependency 'rdoc',          '~> 6.1'
-  gem.add_development_dependency 'bundler',       '~> 2.0'
-  gem.add_development_dependency 'mocha',         '~> 1.8'
-  gem.add_development_dependency 'rake',          '~> 12.3'
-  gem.add_development_dependency 'minitest',      '~> 5.11'
+  gem.add_development_dependency 'rdoc',          '~> 6.4'
+  gem.add_development_dependency 'bundler',       '~> 2.3'
+  gem.add_development_dependency 'mocha',         '~> 2.2'
+  gem.add_development_dependency 'rake',          '~> 13.1'
+  gem.add_development_dependency 'minitest',      '~> 5.21'
   gem.add_development_dependency 'ruby-graphviz', '~> 1.2'
 
 end