diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7bb68cf..16b8098 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,7 +7,7 @@ jobs:
     name: build (${{ matrix.ruby }} / ${{ matrix.os }})
     strategy:
       matrix:
-        ruby: [ 2.7, '3.0', head ]
+        ruby: [ 2.7, '3.0', 3.1, head ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         exclude:
         - { os: windows-latest , ruby: head }
@@ -16,7 +16,7 @@ jobs:
         - { os: windows-latest , ruby: mswin }
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: