diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 106756a5e..ebe891f75 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.1", "3.2"]
+        ruby: ["3.1", "3.2", "3.3"]
         task: ["rack_smoke", "cucumber"]
 
     steps: