RouterOS auto-upgrade - how to choose long-term branch

Hello,

first of all - thank you!

I am a new owner of a hAP_ac_2_tower running ROS v6.45.9 [long-term] and I really do like the hardware and software so far.

What I want to do:

I do not want to bother with checking manually for ROS updates and installations.

I found this in the very good documentation:

https://wiki.mikrotik.com/wiki/Manual:Upgrading_RouterOS#RouterOS_auto-upgrade

However running

/system package update
check-for-updates

gets me this:

/system package update> print
channel: stable
installed-version: 6.45.9
latest-version: 6.46.6
status: New version is available

How may I change the channel from “stable” to “long-term” ?

Thank you in advance