cPanel & WHM version 56 will reach End of Life at the end of April, 2017, and will no longer be supported by cPanel except when upgrading to a supported version. This version is also the last to support CentOS 5, and CentOS 6 (32-bit).
In accordance with our EOL policy (https://go.cpanel.com/longtermsupport), 56 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 once it reaches End of Life.
We recommend that all customers migrate any existing installations of cPanel & WHM 56 to version 62, which you can read more about at the cPanel release site 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.
For the PGP-signed message, see cPanel & WHM version 56 EOL in 60days .