diff --git a/.github/workflows/run_tests.yaml b/.github/workflows/run_tests.yaml
index f6d6cd5..b9bcb02 100644
--- a/.github/workflows/run_tests.yaml
+++ b/.github/workflows/run_tests.yaml
@@ -14,6 +14,7 @@ jobs:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11"]
         os: [ubuntu-latest]
+      max-parallel: 1
     permissions:
       contents: read
       id-token: write