This is a feature release, which includes new features and removes previously deprecated features. The 2.1.x branch is now the supported bugfix branch, the 2.0.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 to pin all dependencies and control upgrades.

• Changes: https://flask.palletsprojects.com/en/2.1.x/changes/#version-2-1-0
• Milestone: https://github.com/pallets/flask/milestone/13?closed=1

We also encourage upgrading to the latest versions of the other Pallets projects as well.

• Werkzeug 2.1 changes: https://werkzeug.palletsprojects.com/en/2.1.x/changes/#version-2-1-0
• Jinja 3.1 changes: https://jinja.palletsprojects.com/en/3.1.x/changes/#version-3-1-1
• Click 8.1 changes: https://click.palletsprojects.com/en/8.1.x/changes/#version-8-1-0
• MarkupSafe 2.1 changes: https://markupsafe.palletsprojects.com/en/2.1.x/changes/#version-2-1-1
• ItsDangerous 2.1 changes: https://itsdangerous.palletsprojects.com/en/2.1.x/changes/#version-2-1-2