Version 5.2.1 of the Passenger application server for Ruby, Node.js, Meteor and Python has been released. We fixed a few important regressions, notably the max pool idle time setting, and a crash in the Apache integration mode. We’ve also made it possible to use our new RAM-based pricing plan on Heroku. For more information on the issues fixed: https://blog.phusion.nl/2018/02/27/passenger-5-2-1/