I've been finishing up my Ghost on AWS instructions, and I added (and have run through) a lengthy last section on upgrades. As part of this, I needed a simple way to upgrade Ghost. I don't want to have to go through the manual steps given, and I couldn't find an existing project that did what I needed. So I made my own:
I just ran it on this blog, and it worked just fine.
npm install -g ghost-upgrade ghost-upgrade --yes --location /var/www/ghost --copy-casper pm2 restart