Git Rename Branch Local and Remote Securely

​1. Rename your local branch. 

If you are on the branch you want to rename: 

git branch -m new-name 

2. Delete the old-name remote branch and push the new-name local branch. 

git push origin :old-name new-name 

3. Reset the upstream branch for the new-name local branch. 

git push origin -u new-name

Thanks to https://multiplestates.wordpress.com/2015/02/05/rename-a-local-and-remote-branch-in-git/