This is a feature release, which includes new features and removes previously deprecated code. The 2.2.x branch is now the supported bug fix branch, the 2.1.x branch will become a tag marking the end of support for that branch. We encourage everyone to upgrade, and to use a tool such as [pip-tools](https://pypi.org/project/pip-tools/) to pin all dependencies and control upgrades.
* Changes: https://flask.palletsprojects.com/en/2.2.x/changes/#version-2-2-0
* Milestone: https://github.com/pallets/flask/milestone/19?closed=1