-r requirements.txt
django==2.1.7
bumpversion==0.5.3
wheel==0.33.1
django-environ==0.4.5
radon==3.0.1
pytz==2018.9
djangorestframework==3.9.1

-r requirements.txt
django==2.1.7
bumpversion==0.5.3
wheel==0.33.1
django-environ==0.4.5
radon==3.0.1
pytz==2018.9
djangorestframework==3.9.2

Update djangorestframework from 3.9.1 to 3.9.2
Update djangorestframework from 3.9.1 to 3.9.2