Using gitlab question

[Jeremy Allison]

I have a pending merge request:

https://gitlab.com/samba-team/samba/merge_requests/558

that has been made unmergable by a commit from another
Team member that needs to go into autobuild before
my change (it's a minor change to test code lists
that needs rebasing).

What is the correct procedure for doing this ?

Do I close the existing merge request and re-issue
a new CI-run followed by merge request ?

Or is there a way to ammend my existing merge
request with an updated patchset once I've
fixed the rebase conflict ?

Just trying to get more familiar with gitlab
workflow here.

Thanks all !

Jeremy.