Heroku: how to scale to multiple workers

Question

I just paid for a Hobby account on Heroku. It says I'm allowed up to 7 worker dynos. How do I turn on more than one dyno?

This is my Procfile:

web: node app.js
worker: node worker.js

I tried to scale the workers with the command:

heroku ps:scale worker=3

But I got this error message:

! Cannot update to more than 1 Hobby size dynos per process type. 

Answer 1

heroku ps:scale web=1 worker=1

more details: here