diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e1dee1d..63f4ad2 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,18 +7,16 @@ jobs:
     name: build (${{ matrix.ruby }} / ${{ matrix.os }})
     strategy:
       matrix:
-        ruby: [ 2.7, 2.6, 2.5, head ]
+        ruby: [ 3.0, 2.7, 2.6, 2.5, head ]
         os: [ ubuntu-latest, macos-latest ]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@master
+    - uses: actions/checkout@v2
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
     - name: Install dependencies
-      run: |
-        gem install bundler --no-document
-        bundle install
+      run: bundle install
     - name: Run test
       run: rake test