If your TeamForge 8.1 site runs on a RHEL/CentOS 6.7 server, you can upgrade to TeamForge 8.2 on the same server.
While it's desirable to upgrade to the latest RHEL/CentOS version, one of the advantages of upgrading to TeamForge 8.2 on RHEL/CentOS 6.7 is the ability to run Black Duck Code Sight on RHEL/CentOS 6.7. Remember, Black Duck Code Sight 2.1.3 has no support for RHEL/CentOS 7.x.