cPanel & WHM version 56 & 60 will reach End of Life at the end of October, 2017, and will no longer be supported by cPanel except when upgrading to a supported version.
In accordance with our EOL policy (https://go.cpanel.com/longtermsupport), 56 & 60 will continue functioning on servers where it is already installed. However, no further updates, such as security fixes and installations, will be provided for 56 & 60 once it reaches End of Life.
Additionally, this is a reminder that v62 will be the only LTS version of 2017, and that v64 will reach End of Life as v66 enters the STABLE tier. For more information, see the cPanel blog post from last year about the LTS changes: https://blog.cpanel.com/cpanels-tiered-update-system-new-plans-for-the-lts-tier/
We recommend that all customers migrate any existing installations of cPanel & WHM version 56 & 60 to the most recent version of cPanel & WHM 66, which you can read about on https://releases.cpanel.com.
If your server setup complicates the process of migrating to a newer version of cPanel & WHM (an upgrade blocker list is available at https://go.cpanel.com/blockers), then cPanel is here to help. Simply open a support ticket at https://tickets.cpanel.net/submit so that our knowledgeable support team can provide recommendations, migration assistance, and more.