We have a 2017 13” MacBook Air that’s periodically of interest to the kids, but Apple doesn’t offer macOS updates for it beyond Monterey (12.x).

I just installed OpenCore Legacy Patcher on it, clicked “Build and Install OpenCore”, rebooted, ran Software Update again, and was offered Sonoma (14.x), the latest available macOS at the time of writing.

Upgraded, rebooted, ran OpenCore Legacy Patcher, clicked “Post-Install Root Patch”, rebooted when prompted, and that was that.