Dash v2.14.1 was just released, and raises the upper limit on Flask (and Werkzeug) to <3.1, to support the latest release. If you’re using any Dash Enterprise packages that use Flask directly, these are still limited to <2.3 for the moment but we’ll be increasing that limit soon.
Going forward, now that we can do this without simultaneously testing all of our other packages, we’ll try to bump these limits right away whenever there’s a new Flask minor or major release, but if we don’t notice it immediately and you need the new version, feel free to create the PR yourself, like the PR included in 2.14.1: