Commits are pushed on a daily basis to tests-passed - you are almost always behind if following that branch 
- and that’s nothing to worry about and normal.
There is no need to upgrade super-regularly unless you notice a bug has been fixed that was impacting you or there is a message on the dashboard telling you to upgrade because of a critical matter (which usually results in a red, sad-face icon).
Upgrading once a month is usually good enough.