.github/workflows/ci.yml in vertebrae-0.8.0 vs .github/workflows/ci.yml in vertebrae-1.0.0

@@ -4,21 +4,21 @@
 jobs:
   test:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@477b21f02be01bcb8030d50f37cfec92bfa615b6
         with:
-          ruby-version: 3.2
+          ruby-version: 2.7
           bundler-cache: true
       - run: bundle install
       - run: bundle exec rspec
   rubocop:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@477b21f02be01bcb8030d50f37cfec92bfa615b6
         with:
-          ruby-version: 3.2
+          ruby-version: 2.7
           bundler-cache: true
       - run: bundle install
       - run: bundle exec rubocop