diff --git a/.github/workflows/rspec.yml b/.github/workflows/rspec.yml
index b072daa..5bfa545 100644
--- a/.github/workflows/rspec.yml
+++ b/.github/workflows/rspec.yml
@@ -7,12 +7,14 @@ on:
 jobs:
   rspec:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        ruby-version: ['3.2', '3.3', '3.4']
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.0.0'
+          ruby-version: ${{ matrix.ruby-version }}
           bundler-cache: true
-      - run: gem install bundler -v '< 2.0'
       - run: bundle install
       - run: bundle exec rake spec
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e8e7b94..9850025 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Unreleased
 
+- Require Ruby 3.2.0 or higher
+
 ## v1.5.0
 
 - Require Faraday v2
diff --git a/README.md b/README.md
index a14643c..fb13d01 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Qiita API v2 client library and CLI tool, written in Ruby.
 
 ## Install
 
-Note: requires Ruby 3.0.0 or higher.
+Note: requires Ruby 3.2.0 or higher.
 
 ```bash
 gem install qiita
diff --git a/qiita.gemspec b/qiita.gemspec
index ee53473..c58b4d6 100644
--- a/qiita.gemspec
+++ b/qiita.gemspec
@@ -15,6 +15,8 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
+  spec.required_ruby_version = '>= 3.2.0'
+
   spec.add_dependency "activesupport"
   spec.add_dependency 'faraday', '>= 2', '< 3'
   spec.add_dependency "rack"