In Moving to new Hugo on 08 January 2022 Manton Reece explains more about the process of updating Hugo.

If you do try Hugo 0.91, I’ve already updated the Default and Marfa plug-ins — as well as some built-in Micro.blog templates — to work with the new version. You can install the latest versions of the plug-ins for those themes to get the latest versions, instead of waiting for Micro.blog to update.