git rebase <branchname>

This command moves the entire commit history of the current branch to start from the latest commit of <branchname>. It effectively replays the commits of your current branch on top of the commits from <branchname>.

This doesn't produce a new merge commit but instead rewrites the commit history.

Variations include using -i for an interactive rebase, allowing you to edit, reorder, or squash commits. Another variant is --continue to proceed after resolving conflicts, or --abort to cancel the rebase. To rebase on the tip of your commits, you can use --onto <newbase>.