Puppet users - Feb 2014 - apache / passenger how do you update puppet on the server in EL6.4?

I've got a working puppet on apache / passenger on EL6.4. However, ever 
since updating the puppet client on computers to 3.4.2, I get notices that 
I'm using insecure YAML and should upgrade the server to 3.3 or newer. How 
do I do this? rpm -qa puppet-server shows puppet-server-3.4.2-1.el6.noarch
so . . . I'm really not sure what's going on.

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