diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f2f3671..1e95835 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -72,7 +72,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@master
         with:
-          python-version: 3.9
+          python-version: 3.7
       - name: Install pipenv
         uses: dschep/install-pipenv-action@v1
       - name: Build docs