It's been a long run, but today CentOS 5 reaches it's end of life.
CentOS 5 will no longer receive bug fixes or security updates from CentOS, and we'll be removing it from our own repositories shortly.
We'd highly encourage anyone running a server with CentOS 5 to migrate to a newer distribution. CentOS 7 would be a good fit, though any Ubuntu LTS or Debian version should work as well.
Instructions for migrating to a new server are available here: