Yum: no updates?

[Fajar Priyanto <fajarpri@xxxxxxxxxx>]

Hi all,
cat /etc/redhat-release
CentOS release 5.4 (Final)

When I check update, yum says not update. What do I miss? Thank you.

yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Setting up Update Process
No Packages marked for Update
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