diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 58bf1c9..43b26fe 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.2", "3.3", "3.4"]
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
         activerecord: [71, 72, 80, 81]
 
     steps: