Change App from Mongrel to Passenger

I have an existing app running on my brightbox that is using mongrel and I would like it to run on Passenger. I tried adding require brightbox/passenger to deploy.rb but after a restart I still go monit notifications saying 2 mongrels instances exist. Thanks.

I’ve just found the answer at the bottom of this wiki page http://wiki.brightbox.co.uk/docs:gemv2:passenger