anjanesh You can check your installed version for an app via
~/apps/my_app/env/bin/python -c "import django; print(django.VERSION)"
Our Django installer always installs the latest release, so when you create a new app after 4.0 is released it will be that version.
When you want to upgrade Django in one of your installed apps then follow the Django upgrade instructions. The specific commands for upgrading Django in a Django app installed via our dashboard are:
python -m pip install -U Django