upgrading mysql (and others) using yum or apt-get?

[Jim]

I have an fc3 machine that im trying to upgrade mysql (and other 
packages too, but i'll start with just mysql).  I guess fc3 comes with 
mysql 3.23 but i want to install the newest available (4.1).  When 
trying to run yum to update this, it tells me the newest version (3.23) 
is already installed.  apt-get tells me the same thing so i assume that 
3.23 is the newest version in whatever repo im using.  Is there a way i 
can force is to get a later version?  do i have to add another repo to 
yum.conf?  Im new to this whole yum thing so any hints here would be 
appreciated.  I could always go grab the rpms manually and install them 
but im worried about dependency issues and the mixing of auto/manual 
updating.

Thanks,

-Jim