diff --git a/.github/workflows/reviewdog.yml b/.github/workflows/reviewdog.yml
index 5f8c520..46b6ab6 100644
--- a/.github/workflows/reviewdog.yml
+++ b/.github/workflows/reviewdog.yml
@@ -17,7 +17,7 @@ jobs:
       uses: ruby/setup-ruby@v1
       with:
         bundler-cache: true
-        ruby-version: '3.0'
+        ruby-version: '3.1'
 
     - name: rubocop
       uses: reviewdog/action-rubocop@v2
diff --git a/.github/workflows/ruby_test.yml b/.github/workflows/ruby_test.yml
index 23a1b13..8209214 100644
--- a/.github/workflows/ruby_test.yml
+++ b/.github/workflows/ruby_test.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.7', '3.0', '3.1']
+        ruby-version: ["3.1", "3.2", "3.3"]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Ruby
diff --git a/.rubocop.yml b/.rubocop.yml
index fdc38b5..400716a 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -3,7 +3,7 @@ require:
   - rubocop-performance
 
 AllCops:
-  TargetRubyVersion: 2.7
+  TargetRubyVersion: 3.1
   DisplayCopNames: true
   Exclude:
     - bin/**/*
diff --git a/mato.gemspec b/mato.gemspec
index 97129cb..e12cf78 100644
--- a/mato.gemspec
+++ b/mato.gemspec
@@ -25,7 +25,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = ">= 2.7"
+  spec.required_ruby_version = "~> 3.1"
 
   spec.add_runtime_dependency "commonmarker", "~> 1.0"
   spec.add_runtime_dependency "markly", "~> 0.9"