I'm running Civi 5.19.alpha1 with Drupal locally. I have CiviVolunteer 4.7.31-2.3.1, which is the latest release listed on GitHub, from June 2018.
I want to update to the latest stuff in the repo, which I believe fixes a bug.
I don't see a way to do that in the Admin UI.
git pull https://github.com/civicrm/org.civicrm.volunteer.git
from my ext directory at
and I get
fatal: refusing to merge unrelated histories.