diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b30f70f..f612da2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.0", 3.1, 3.2, 3.3, 3.4]
+        ruby: ["3.0", 3.1, 3.2, 3.3, 3.4, 3.5, 4.0]
         gemfile:
           [
             activesupport-7.1,