The front of the bunkroom with the safe in the far right corner.
Combination Update is a written note found in Dishonored.
Transcript[]
Wyman,
I've updated the combination on the bunkhouse safe again. It's 2 0 3. As treasurer, it's up to you to make sure it stays secret this time. Don't leave this letter lying around.
Brandon
Location[]
It can be found on a table under a Serkonan blood sausage in the Overseer mess hall in the Back Yard during the mission High Overseer Campbell.