[CentOS] update from 4.2 to 4.3?

Hi List;

Whats the preferred method to update from 4.2 to 4.3? Can I use yum to do 
this, If so, can someone send me the appropriate install or update command 
string to pass to yum?

Also, Do I need to add any specific yum repositories or will the stock 4.2 yum 
configuration work (assumint that yum is the best way to do the upgrade) ?

Thanks in advance for your help...

/Kevin