git branch -m <old_branchname> <new_branchname>

This command renames a branch from <old_branchname> to <new_branchname>. It updates all references to the branch and creates a new branch with the at the same commit as the .

-m is a shortcut for --move

Variations of this command include using the -M flag instead of -m to force renaming even if <new_branchname> already exists. -M is a shortcut for --move --force.