diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fc9efa1..046ad10 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,6 +30,7 @@ jobs:
           - "3.0"
           - "3.1"
           - "3.2"
+          - "3.3"
           - ruby-head
           - jruby-9.2
           - jruby-9.3