diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cb0f483..a73d233 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,8 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
-          - 'head'
+          - '3.3'
+          - '3.4'
         exclude:
           - ruby: '2.3'
             rack-version: '~> 3.0'