There have been more than a few posts over the months since we shipped our first non-beta/alpha release asking about how to get off the beta channel. Well, now is your chance. If you've been on the beta channel and you don't want to be any more, run the following command in the command box:
set update channel to default
then run this one:
update now
Doing that should ensure that you get Logos 4 Mac 4.0b RC-1. Once you're running that release, it'll only grab updates from the stable channel going forward.