Upgrading Bind

[questions]

Hello list,

	Current O/S version = FreeBSD 4.10-RELEASE
	Current Bind version = named 8.3.7-REL

	Does anyone know if upgrading Bind/named 8.3.7 to 9.3 is
recommended within 4.10-RELEASE? If so can this be accomplished using the
portupgrade command or should a different method be used like downloading
bind9.tar.gz file and running make install?

Thanks in Advance for any help -

Dave