centos 5.9 dan mysql 5.0.x

[root@eprints ~]#yum info mysql
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.biz.net.id
 * epel: mirror.rndc.or.id
 * extras: centos.biz.net.id
 * rpmforge: mirror.smartmedia.net.id
 * updates: centos.biz.net.id
Installed Packages
Name       : mysql
Arch       : i386
Version    : 5.0.95
Release    : 5.el5_9
Size       : 8.0 M
Repo       : installed
Summary    : MySQL client programs and shared libraries
URL        : http://www.mysql.com
License    : GPLv2 with exceptions
Description: MySQL is a multi-user, multi-threaded SQL database server. MySQL is a
           : client/server implementation consisting of a server daemon (mysqld)
           : and many different client programs and libraries. The base package
           : contains the MySQL client programs, the client shared libraries, and
           : generic MySQL files.

[root@eprints ~]#

kenapa belum menggunakan mysql 5.1.x ?