Update test-and-deploy.yml
@@ -93,7 +93,7 @@ jobs:
# https://github.com/executablebooks/jupyter-book/issues/906 is fixed.
# See https://jupyterbook.org/advanced/advanced.html#working-on-windows
- os: 'ubuntu'
- python-version: 3.9
+ python-version: 3.8
- os: 'windows'
python-version: 3.7
- os: 'macos'
