Execute the following steps:

1. Migrate all of your apps to the latest South migrations, as follows:

(myproject_env)$ python3 manage.py migrate

Remove south from INSTALLED_APPS, in the settings.

2. For each app with South migrations, delete the migration files and leave only the migrations directories.
3. Create new migration files with the following command:

(my_project)$ python3 manage.py makemigrations

4. Fake the initial Django migrations, as the database schema has already been set correctly:

(my_project)$ python3 manage.py migrate --fake-initial

5. If there are any circular relationships in the installed apps (that is, two models in different apps pointing to each other with a foreign key or many-to-many relation), apply the fake initial migrations to each of these apps separately, as follows:

(my_project)$ python3 manage.py migrate --fake-initial demo_app