diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 45e2ac8..241acde 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,10 @@ jobs:
           - "2.7"
           - "3.0"
           - "3.1"
+          - "3.2"
+          - "3.3"
+          - "3.4"
+          - "4.0"
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
diff --git a/safemode.gemspec b/safemode.gemspec
index 31a7116..57f51df 100644
--- a/safemode.gemspec
+++ b/safemode.gemspec
@@ -52,7 +52,7 @@ Gem::Specification.new do |s|
     "test/test_safemode_parser.rb"
   ]
 
-  s.required_ruby_version = ">= 2.7", "< 3.2"
+  s.required_ruby_version = ">= 2.7", "< 4.1"
 
   s.add_runtime_dependency "ruby2ruby", ">= 2.4.0"
   s.add_runtime_dependency "ruby_parser", ">= 3.10.1"