[CentOS] Glibcxx_3.4.9 not found

Hi,
I am running CentOS 5.3. 64 bit version. I have tried updating the OS but
every time I run an application I need it reports that Glibcxx_3.4.9 is
missing.  I tried to do a search for this but cannot find it for my system.

When CentOS upgraded to 5.3 I had hoped that the new Glibcxx would have been
included but it is not.

Is there an easy way to update the OS to include this?

You can probably tell from the question that I am a Linux Newbie so please
try to keep the answers simple.

Many Thanks

Chris