diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 72ceb18..d834e25 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -29,7 +29,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.12
+          python-version: 3.9
           cache: "pip"
           cache-dependency-path: "**/requirements_dev.txt"
       - name: Run tests