.github/workflows/ci.yml in attr_json-1.4.0 vs .github/workflows/ci.yml in attr_json-1.4.1

@@ -52,18 +52,21 @@
 
           - gemfile: rails_6_1
             ruby: 2.7
 
           - gemfile: rails_6_1
-            ruby: 3.0
+            ruby: '3.0'
 
           - gemfile: rails_7_0
-            ruby: 3.0
+            ruby: '3.0'
 
+          - gemfile: rails_7_0
+            ruby: 3.1
+
     name: ${{ matrix.gemfile }}, ruby ${{ matrix.ruby }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}