diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index 914dd62..99cc54c 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 4.0.5
+          ruby-version: 3.3
           bundler-cache: true
       - run: bundle config set --global path "$(pwd)/vendor/bundle"
       - run: bundle install --no-color
diff --git a/test/test_workflows.rb b/test/test_workflows.rb
new file mode 100644
index 0000000..ded8808
--- /dev/null
+++ b/test/test_workflows.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 Zerocracy
+# SPDX-License-Identifier: MIT
+
+require 'minitest/autorun'
+require 'yaml'
+
+class TestWorkflows < Minitest::Test
+  def test_codecov_uses_rake_ruby_version
+    root = File.expand_path('..', __dir__)
+    c = YAML.safe_load_file(File.join(root, '.github', 'workflows', 'codecov.yml'))
+    r = YAML.safe_load_file(File.join(root, '.github', 'workflows', 'rake.yml'))
+    ss = c.fetch('jobs').fetch('codecov').fetch('steps')
+    s = ss.find { |step| step['uses'] == 'ruby/setup-ruby@v1' }
+    cv = s.fetch('with').fetch('ruby-version')
+    m = r.fetch('jobs').fetch('rake').fetch('strategy').fetch('matrix')
+    rv = m.fetch('ruby').first
+    assert_equal(rv, cv)
+  end
+end