[__turbobrew__]

> CI would fail on existing code that previously passed.

You problem isn’t that black changed formatting rules, your problem is that you didn’t pin CI dependencies. This isn’t a unique problem to black, any other tool used in CI pipelines can cause things to break if you don’t pin them.

[danuker]

Indeed. Something wihout security impact will use pointless resources when you update. Do it rarely (or never if possible).