origin/main) gets ahead of your local repository while you're developing, you can use gt repo sync to bring your stack up-to-date.gt repo sync does a few things:origin/main (or whatever your trunk branch is)main. If you encounter any merge conflicts, you'll be prompted to resolve them as part of the restack — see the section on restacking for more details!gt log, we see that part_2 is now based on main:sync command here (we could have done so with --restack), we see that part_2 needs a restack onto main. We'll talk about what that means in the next section: Restacking branches.