diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7440121..4089b9a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby-version: ['3.4', '3.3', '3.2', '3.1']
+        ruby-version: ['4.0', '3.4', '3.3']
         node-version: ['16', '18', '20', '22']
 
     steps:
diff --git a/execjs-pcruntime.gemspec b/execjs-pcruntime.gemspec
index 6ee04d9..add725b 100644
--- a/execjs-pcruntime.gemspec
+++ b/execjs-pcruntime.gemspec
@@ -8,7 +8,7 @@ Gem::Specification.new do |spec|
   spec.name          = 'execjs-pcruntime'
   spec.version       = Execjs::PCRuntime::VERSION
   spec.authors       = ['White-Green']
-  spec.required_ruby_version = '>=3.1.0'
+  spec.required_ruby_version = '>=3.3.0'
   spec.summary       = 'Fast ExecJS Runtime using Process as a Context.'
   spec.homepage      = 'https://rubygems.org/gems/execjs-pcruntime'
   spec.license       = 'MIT'