diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a2fb0f7..c994489 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     name: build (${{ matrix.ruby }} / ${{ matrix.os }})
     strategy:
       matrix:
-        ruby: [ '3.0', 2.7, 2.6, head ]
+        ruby: [ '3.1', '3.0', 2.7, head ]
         os: [ ubuntu-latest, macos-latest, windows-latest ]
         exclude:
           - ruby: head