diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 64c1784..d4ca584 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,7 @@ jobs:
         - '2.6'
         - '2.7'
         - '3.0'
+        - '3.1'
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby ${{ matrix.ruby-version }}