Note: This version of the VDT (1.11.0) is no longer supported. Feel free to look through the documentation and install it, but we cannot guarantee support for it. The current stable release is 2.0.0.
The vdt-update-certs script is designed to help keep your CA Certificates up to date. It runs out of cron, and will check for a new certificates package once per day.
For more information on using vdt-update-certs, see this page.