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 version 56 to the most recent version of cPanel & WHM 62, 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 HaBangNet is here to help. Simply open a support ticket, so that our knowledgeable support team can provide recommendations, migration assistance, and more.