Maintenance Policy

This document describes the official CAS policy as it regards maintenance and management of released CAS server versions.

In particular, the following questions are addressed:

  • How long should a CAS release be maintained?
  • What is the appropriate scope for release maintenance once a release is retired?


The project release schedule is available here.


  • CAS adopters MAY expect a CAS release to be maintained for six months, starting from the original release date.
  • Maintenance during this year includes bug fixes, security patches and general upkeep of the release.
  • Afterwards, maintenance of the release is strictly limited to security patches and fixing vulnerabilities for another six months (i.e. SPM mode).
  • The lifespan of a release MAY be extended beyond a single year, to be decided by the CAS PMC and the community at large when and where reasonable.

By “CAS Release”, we mean anything that is a feature release and above. (i.e. 4.1.x, 4.2.x, 5.0.x, 5.1.x, etc).

EOL Schedule

The following CAS releases will transition into a security-patch mode (SPM) only and will be EOLed at the indicated dates.

Release SPM Starting Date Full EOL
6.1.x December 1st, 2019 June 1st, 2020
6.0.x June 29th, 2019 December 29th, 2019
5.3.x June 29th, 2019 July 29th, 2020
5.2.x November 27th, 2018 November 27th, 2019

All previous releases absent in the above table are considered EOLed.