Heroku push failing due to New Relic RPM gem
EDIT: 3.5.8.72 of the gem has been released @thanks Chris
It appears the Bundler Dependency API is having issues.
newrelic_rpm-3.5.6.46 was yanked on January 22, 2013. But is still being requested by the API.
Locking your gemfile to the current release will fix the issue in the meantime.
gem "newrelic_rpm", "~> 3.5.5.38"
As chrislopresto mentioned, you may need to do a
bundle update newrelic_rpm
I'm posting this as an answer since it was suggested, and hey, versions change.