diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 8bf84d15..e90fddef 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.2'
+          ruby-version: '3.1'
       - run: bundle update
       - run: bundle exec rake
       - uses: codecov/codecov-action@v4
diff --git a/.github/workflows/rake.yml b/.github/workflows/rake.yml
index 59870154..798b81f5 100644
--- a/.github/workflows/rake.yml
+++ b/.github/workflows/rake.yml
@@ -12,8 +12,8 @@ jobs:
     name: test
     strategy:
       matrix:
-        os: [ubuntu-20.04]
-        ruby: [3.2]
+        os: [ubuntu-22.04]
+        ruby: [3.1.0]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/Gemfile b/Gemfile
index ac390819..8736a875 100644
--- a/Gemfile
+++ b/Gemfile
@@ -37,6 +37,7 @@ gem 'octokit', '8.0.0'
 gem 'pdd', '0.23.2'
 gem 'rack', '3.0.9'
 gem 'rack-test', '2.1.0'
+gem 'rackup', '2.1.0'
 gem 'rake', '13.1.0', require: false
 gem 'rubocop', '1.60.2', require: false
 gem 'rubocop-rspec', '2.26.1', require: false
diff --git a/Gemfile.lock b/Gemfile.lock
index ebadf327..17bd6887 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -139,6 +139,9 @@ GEM
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
+    rackup (2.1.0)
+      rack (>= 3)
+      webrick (~> 1.8)
     rainbow (3.1.1)
     rake (13.1.0)
     rb-fsevent (0.11.2)
@@ -253,6 +256,7 @@ DEPENDENCIES
   pdd (= 0.23.2)
   rack (= 3.0.9)
   rack-test (= 2.1.0)
+  rackup (= 2.1.0)
   rake (= 13.1.0)
   rubocop (= 1.60.2)
   rubocop-rspec (= 2.26.1)
@@ -269,4 +273,4 @@ DEPENDENCIES
   xcop (= 0.7.1)
 
 BUNDLED WITH
-   2.3.17
+   2.4.10