diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d16269a..df41b5a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,8 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
+          - '3.3'
+          - ruby-head
     name: RSpec tests ruby ${{ matrix.ruby }}
     steps:
       - name: Check out code