Reached end of life
I've got a 27" mid-2017 iMac (model 18,3) that I really like, especially the retina display. It's running macOS 13.6.1. It won't update to 13.6.2. or to Sonoma. I don't really care being stuck with this OS, except for security updates. Does apple typically push security updates to their older OS machines? If there is no added security risk then no reason to buy new hardware.