Seems like an issue on Heroku's end really, maybe some build dependency timeout which is then cached or something. At any rate, I'd either dig in or contact Her

Seems like an issue on Heroku's end really, maybe some build dependency timeout which is then cached or something. At any rate, I'd either dig in or contact Heroku, I couldn't imagine leaving that lie without knowing the cause. Often, the root cause of this will bite you hardest when you need it least.