diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a300bbd..c1d5638 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ['3.4', '3.3', '3.2', '2.7']
+        ruby-version: ['4.0', '3.4', '3.3', '3.2', '2.7']
 
     steps:
     - uses: actions/checkout@v4