This series of Django releases was supported from 2021-12-07 to 2023-04-01.

Release Highlights

• Django’s default timezone implementation is now zoneinfo from the Python standard library (as of Python 3.9).
  • Support for pytz and use of pytz time zones is now deprecated and will be removed in Django 5.0.
• Forms, Formsets and ErrorList are now rendered using the template engine
• There’s now built-in support for Redis caching via redis-py 3.0.0 or higher.

Upgrade Gotchas

• Official support for Python 3.6 and 3.7 has been dropped. Officially supported Python versions are now 3.8, 3.9, and 3.10.
  • If you’re coming from Django 3.2 (which supported Python 3.6-3.10), note that zoneinfo (see above) is only in the Python standard library as of Python 3.9. So you’ll probably want to upgrade to at least that version of Python if you’re going to Django 4.0
  • It’s worth repeating/rephrasing: support for pytz is now deprecated and will be removed in Django 5.0. You can still use pytz in Django 4.0 if you want, or, you can go the Python 3.9/zoneinfo route now and avoid future upgrade hassles in Django 5.0
• Dropped support for PostgreSQL 9.6 and Oracle 12.2 and 18c. Django 4.0 supports PostgreSQL 10.0+ and Oracle 19c
  • minimum supported version of psycopg2 is now 2.8.4, since it’s the first release to support Python 3.8
• Multiple features deprecated in Django 3.0 and 3.1 have been removed in 4.0