What OS version is now considered the minimum for Discourse

There was a similar thread, now closed, so I started this one.

I consider this a moving target, so does any one know what is the last version you need on a Mac in order for you to qualify as supported?

Thanks for reading.

For context, I'll provide a link to a previous topic regarding Discourse support for browser versions:

Note that the primary concern is the version of the web browser (and more specifically, the feature set it provides).

There is a correlation with operating system version due to the fact that someone using an older operating system version may be unable to upgrade their browser beyond the version where a dependency on a newer version of the operating system was introduced. However, it is worth noting that in some cases it may be possible to work around the limitation imposed by the operating system by switching to using a different web browser which has the feature set required by the Discourse forum software and also support for the older operating system version.