-r requirements.txt
flake8==3.9.2
pytest==7.0.1
pytest-cov==2.12.1
pytest-django==4.4.0

-r requirements.txt
flake8==4.0.1
pytest==7.0.1
pytest-cov==2.12.1
pytest-django==4.4.0

Update flake8 from 3.9.2 to 4.0.1
Update flake8 from 3.9.2 to 4.0.1