diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3cf4f96..237e09b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,7 +7,7 @@ jobs:
     name: build (${{ matrix.ruby }}
     strategy:
       matrix:
-        ruby: [ 3.2, 3.1, '3.0', 2.7, head ]
+        ruby: [ 3.3, 3.2, 3.1, '3.0', head ]
     runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v4