6.6 to 6.7 upgrade error

following this instruction - https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/update/6.6-to-6.7.md

root@git:/home/git/gitlab# sudo service gitlab stop
Shutting down both Unicorn and Sidekiq.
GitLab is not running.
root@git:/home/git/gitlab# cd /home/git/gitlab
root@git:/home/git/gitlab# sudo -u git -H git fetch --all
Fetching origin
root@git:/home/git/gitlab# sudo -u git -H git checkout 6-7-stable
error: pathspec '6-7-stable' did not match any file(s) known to git.

is there any way how I can fix it and make an update?

GitLab 6.7 is not yet released. Therefore there is no branch `6-7-stable. Current stable release is 6.6.5

Status changed to closed

mentioned in commit ea5bdd84

Mentioned in commit ea5bdd84

mentioned in merge request !14785