diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 660e0755..783a7909 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -5,7 +5,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, head]
+        ruby: [2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.0, 3.1, head]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2