diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa89bae..6fb63b2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,7 @@ jobs:
           - "2.6"
           - "2.7"
           - "3.0"
+          - "3.1"
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby