diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index cc64777..ecb694d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -89,7 +89,7 @@ jobs:
         run: |
           git clone --branch main --single-branch https://github.com/aceinnolab/Inkycal
           cd Inkycal
-          python3 -m venv venv
+          python3.9 -m venv venv
           source venv/bin/activate
           python -m pip install --upgrade pip
           pip install wheel