To see what versions of Meza are available, do:

sudo meza update

This will list available versions. You can then select one of those versions to update to by doing:

sudo meza update <version>

You can also update to the most recent version of a branch. For example, the 31.x branch is where all 31.x.y versions exist. By doing sudo meza update 31.x you'll be at the latest 31.x version.