We're following Calendar Versioning with generous backwards-compatibility guarantees. Therefore, we only support the latest version.
That said, you shouldn't be afraid to upgrade if you only use our documented public APIs and pay attention to DeprecationWarnings.
Whenever there is a need to break compatibility, it is announced in the changelog and raises a DeprecationWarning for a year (if possible) before it's finally really broken.
Caution
Do not use Tenacity's features through stamina. We cannot and do not guarantee that such leaking behavior will keep working in future releases. If you're missing a Tenacity feature that would be a good fit for stamina, please open an issue.
To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.