Pkg.update() prompts for git ssh key

pkg
git

#1

How do I figure out which package is responsible for this?

julia> Pkg.update()
INFO: Updating METADATA...
Private key location for 'git@github.com' [/Users/cbinz/.ssh/id_rsa]:

I’m only on master for a couple unregistered packages, and git remote -v doesn’t seem to show anything unusual in those directories.