Per #8511 we have now released pip 20.2. This release includes the beta of the next-generation dependency resolver. It is significantly stricter and more consistent when it receives incompatible instructions, and reduces support for certain kinds of constraints files, so some workarounds and workflows may break. Please test it with the --use-feature=2020-resolver flag. Please see our guide on how to test and migrate, and how to report issues. The new dependency resolver is off by default because it is not yet ready for everyday use.

We plan to make pip's next quarterly release, 20.3, in October 2020. We are preparing to change the default dependency resolution behavior and make the new resolver the default in pip 20.3.

Please spread the word by pointing to this blog post -- spread the word on Hacker News, Reddit, Twitter, Facebook, Dev.to, Telegram, relevant Stack Overflow answers, and your favorite Slacks and Discords. Most of the people this will affect do not keep up with Python-specific developer news. Help them get the heads-up before October, and help us get their bug reports.

(Copying my note from #988.)

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