Every day search engines crawl the web looking for new websites. Doing so they save billions of documents and store them in databases called index.
For a search engine to know your CV has been updated it need to get a notice and that's what we do each time you do an update. But from there, each search engines has its own rules and decides when to check the update is real and therefore when to index the update. It's often very quick, but sometimes it takes a little longer and there is nothing we (or you) can do about it unfortunatly.
You need to be patient and things will come through given time ! :)