diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cb0f483..ac8ffcd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,6 +20,7 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
+          - '3.3'
           - 'head'
         exclude:
           - ruby: '2.3'