upgrade postgres to 8.4.8, centos 5.3

hello all,
i have a centos 5.3 which has postgres 8.4.4 installed from the repos. I
want to upgrade to 8.4.8 but when i try to install the .bin file of 8.4.8
then it's a new installation and when i try to run yum check-update nothing
new is there. any ideas? tnx in advance

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