Dumb

Hi, I have a dum question. I recently picked up a new RH9 dedicated server. Apache 2, Mysql 3 and php4 are all installed , via rpm I am assuming. I upgraded mysql to version 4, however, php is still using the version 3 client. (from php_info) How do I get php4 to use the mysql4 client? I would like to know if this is possible just using rpms. I could do it re-compiling everything myself, but I kind of want to stick to the rpm style installation on this server if possible. Thanks for any help.