When I tried to push my changes to a staging dyno on Heroku I got this message when it\'s building:
$ git push staging . . . remote: -----> Installing dep
The cache in heroku dyno needs to be purged. Heroku made a plugin that can do just that. Install it:
$ heroku plugins:install heroku-repo
And run:
$ heroku repo:purge_cache -a $APPNAME
Then deploy again.