diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d389cee..1c322ab 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,6 +22,7 @@ jobs:
     # Defines PHP Versions matrix to run tests on
     strategy:
       fail-fast: false
+      max-parallel: 1
       matrix:
         php-versions: [ '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]