[CentOS] point release security updates?

I have a question regarding security updates for Centos 4.

If you are currently running older point releases for example CentOS 4.1 or
4.2, do you have to upgrade to CentOS 4.3 to be able to get the latest
security updates or can you simply stick to the old point release?

I notice that there is sendmail update in 4.3 but not in 4.2

Cheers,
Chris
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