diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 0010aea12..59dad0ffd 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -95,7 +95,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.8'
+          python-version: '3.7'
       - if: matrix.os == 'windows-latest'
         uses: actions/cache@v1
         with:
@@ -158,7 +158,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.8'
+          python-version: '3.7'
       - run: pip install tox
       - uses: actions/download-artifact@master
         with: