diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 35f6b3c..2065bac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ['2.4', '2.5', '2.6', '2.7', '3.0']
+        ruby: ['2.4', '2.5', '2.6', '2.7', '3.0', '3.1']
 
     steps:
     - uses: actions/checkout@v2