PHP 5.6.4 and 5.5.20 now available
Change effective on 19 December 2014
PHP versions 5.6.4 and 5.5.20 are now available on Heroku. PHP 5.6.4 will be the default stable runtime version used on app pushes unless a different version is explicitly selected.
newrelic extension is now available as version 18.104.22.168.