Changing the default branch
If you have more than one branch in your repository, you can configure any branch as the default branch.
Who can use this feature?
People with admin access for a repository can change the default branch for the repository.
About changing the default branch
You can choose the default branch for a repository. The default branch is the base branch for pull requests and code commits. For more information about the default branch, seeAbout branches.
You can also rename the default branch. For more information, seeRenaming a branch.
You can set the name of the default branch for new repositories. For more information, seeManaging the default branch name for your repositories,Managing the default branch name for repositories in your organization, andEnforcing repository management policies in your enterprise.
Prerequisites
To change the default branch, your repository must have more than one branch. For more information, seeCreating and deleting branches within your repository.
Additionally, you need to have admin access to a repository to change the default branch.
Changing the default branch
On GitHub, navigate to the main page of the repository.
Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then clickSettings.

Under "Default branch", to the right of the default branch name, click.
Select the branch dropdown menu and click a branch name.
ClickUpdate.
Read the warning, then clickI understand, update the default branch.