diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 258a9ac..eb08ba7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,7 @@ jobs:
         - '2.5'
         - '2.6'
         - '2.7'
+        - '3.0'
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby ${{ matrix.ruby-version }}