diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index d79847e..f825fff 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -15,3 +15,5 @@ jobs:
           memory_limit: 1G
           args: --memory-limit 1G
       - uses: php-actions/phpunit@v3
+        with:
+          version: 9