[Dovecot] Upgrade To New Version

I am currently running Dovecot on DoD production email server (Postfix) and the latest version the software available from Redhat is dovecot-0.99.11-8.EL4. According to you guys, this is ancient and I was wondering what is the safest and easiest way to get my version updated without breaking it...

Thanks for any help and or points in the right direction...

[root@mail ~]# dovecot -n Usage: dovecot [-F] [-c <config file>]