diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f7dd312..77a289a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -52,7 +52,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r ./sim/requirements.txt
-        pip install pytest
+        pip install "pytest<9"
     - name: Run the tests
       run: |
         cd ./sim/apps/HexManager