The nginx version was updated from 1.16.0 to 1.26.1. Existing sites are automatically upgraded.
Thanks for the heads up. Starting up and provisioning the old nginx sites the very first time after updating to Local 9.1.0 took hell of a time and my MacBook Pro locked up for a while the CPU load spiked. But after a while everything settled down and the CPU load went back down to normal. Changing the PHP version works as usual but there is something strange about the nginx version. It looks like Local is trying to download the old 1.16.0 nginx version and not recognizing 1.26.1 as the actual version. You see the download icon in front of the Nginx name in the drop-down menu? And then Local is trying to change the web server version from “nginx to nginx” and download 1.16.0. But the only nginx version downloaded in the lightning-services folder is the new 1.26.1. Please see the attached screenshots.