diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b131018..de78b8c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['3.0', '3.1', '3.2', head]
+        ruby: ['3.2', '3.3', head]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
diff --git a/rbs_rails.gemspec b/rbs_rails.gemspec
index da79613..b85469d 100644
--- a/rbs_rails.gemspec
+++ b/rbs_rails.gemspec
@@ -10,7 +10,7 @@ Gem::Specification.new do |spec|
   spec.description   = %q{A RBS files generator for Rails application}
   spec.homepage      = "https://github.com/pocke/rbs_rails"
   spec.license       = 'Apache-2.0'
-  spec.required_ruby_version = Gem::Requirement.new(">= 3.0")
+  spec.required_ruby_version = Gem::Requirement.new(">= 3.2")
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage