Zammad has to main branches:
develop(alpha, non stable)- and
stable
The vast majority of commits and thus “updates” go to Zammads develop branch.
However, if there’s small bug fixes that very little impact on existing instances or a hotfix is required (e.g. after a release), it’s being rebased to stable as well.
We’re having a rolling stable. You get minor updates when they’re ready. This is nothing to be concerned about. You’re also not forced to install those. Other wise you may have to wait for bug fixes to the next release which might be unacceptable depending on how bad the situation is.