How do I update bors-ng in Heroku?


We set up Bors-ng using the "Deploy to Heroku" button in your Github readme. It has been working great for some time but now we would like to update our Bors-ng version to the latest version. How can we update the version that is running in our Heroku instance? I tried the instructions I found here (basically download the Github repo, add a new Heroku remote and push master to this remote) but I got a "Push rejected" message (I guess that the master branch is somehow protected)

Thanks in advance for your help!!


In case it helps someone, I was able to solve this by clearing the Heroku build cache