It's recommended to test it in a test box before upgrading it in a production server..
AssistanZ - Beyond Boundaries... Cloudstack Consultancy / 24x7 Web Hosting Support / 24x7 Server Management / Infrastructure Management Services Web & Mobile Apps Development / Web Designing Services / Php, Grails, Java Development
As with anything, if you aren't sure, yes, test it. However, if you know what you're doing, I'm sure you'd agree that upgrading OpenSSH is not something you need to usually test before upgrading. Agreed, anyone you're not familiar with, if you're new to this, you indeed would be wise to test it first.
They all have README/INSTALL files that are very straight forward.
Or use yum to install the newest RPM version.
However, if you're using Cpanel (hopefully!) it should (eventually--hopefully sooner than later) upgrade the OpenSSH version installed on your server for you on an update. It will not show as being the newest one on the OpenSSH site, but will be a patched version, likely reported as 3.x something.
He said he was using FC3. I agree, however, don't assume or rely on Cpanel to update it, if you aren't sure if the OS you are using is still supported. In fact, I'd not rely on it doing that anyway, but then again, I'd never use Cpanel.