diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
index 6d15be3..82911d3 100644
--- a/.github/workflows/unit_tests.yml
+++ b/.github/workflows/unit_tests.yml
@@ -17,6 +17,7 @@ jobs:
     uses: neongeckocom/.github/.github/workflows/docker_build_tests.yml@master
   unit_tests:
     strategy:
+      max-parallel: 1
       matrix:
         python-version: [3.7, 3.8, 3.9, '3.10']
     runs-on: ubuntu-latest