Downgrade RHEL 6.5 to 6.4

We have few RHEL Servers that are running RHEL 6.4. We added few more servers this week and those servers were updated to the RHEL v6.5 automatically with the YUM update.

In order to maintain the servers of a same project in same version, we would like to downgrade the RHEL OS 6.5 to RHEL OS 6.4. What is the right procedure to do that?

Looking forward for some useful assistance from the community.

Regards
Jo