How to stop GitHub vulnerability alerts from deleted branch?

GitHub reported vulnerability from a file that is in a branch that I no longer use. So, I deleted the branch as it was not required any more but, the vulnerability alert is still visible.

How do I dismiss this alert? How can I tell GitHub that a branch no longer exists and stop vulnerability alerts for it?

:wave: Welcome!

I should be able to fix this for you. If you’re happy to tell me which repository is causing you trouble, please do. If you’d prefer to not do this publicly, you’re welcome to open a ticket and they can do that for you by email: