How to package upgrade using terminal

How can I update packages using terminal in mikrotik router board. I want to bugfix packages. How do I assign chain bugfix ?
[admin@MikroTik] > system package update check-for-updates

append –
as-value –
do –
file –
interval –
once –
without-paging –

/system package update> set channel=

https://wiki.mikrotik.com/wiki/Manual:Upgrading_RouterOS#RouterOS_version_release_chains