Upgrade heroku stack - MUMT-IT/mis2018 GitHub Wiki

Heroku stack is updated regularly. The app using deprecated stack will not be deployed. To check the current stack, run this command.

heroku stack -a <your app name>

To upgrade to a newer version, run this command. (You should try this on the test machine first!)

heroku stack:set <new stack> -a <your app name>

Then push again to redeploy the app.