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Phusion Passenger 4.0.55 released, supports Ruby 2.2

By Hongli Lai on December 15th, 2014

Phusion Passenger is a fast and robust web server and application server for Ruby, Python, Node.js and Meteor. Passenger takes a lot of complexity out of deploying web apps, and adds powerful enterprise-grade features that are useful in production. High-profile companies such as Apple, New York Times, AirBnB, Juniper, American Express, etc are already using it, as well as over 350.000 websites.

Phusion Passenger is under constant maintenance and development. Version 4.0.55 is a bugfix release.

Phusion Passenger also has an Enterprise version which comes with a wide array of additional features. By buying Phusion Passenger Enterprise you will directly sponsor the development of the open source version.

Recent changes

Version 4.0.54 has been skipped because it was a hotfix for Enterprise customers. The changes in 4.0.54 and 4.0.55 combined are as follows:

  • Supports Ruby 2.2. Ruby 2.2 isn’t released yet and only exists as an alpha, but we’re supporting it anyway. Closes GH-1314.
  • Fixed Linux OS name detection.
  • Contains a licensing-related hot fix for Enterprise customers.

Installing or upgrading to 4.0.55

OS X OS X Debian Debian Ubuntu Ubuntu
Heroku Heroku Ruby gem Ruby gem Tarball Tarball


Phusion Passenger’s core is open source. Please fork or watch us on Github. 🙂

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