Whats an UPDATE
In the eyes of the search engines and Professional SEO’s an update is a change to the algo that they are running currently.
What isn’t a update !
More pages of your site indexed, that’s just the SE being nice or increasing the index size
More backlinks, again that’s a index size increase
More Pagerank or Less Pagerank.. Google updates this every 3 or so months, but it’s nothing to do with an algo UPDATE.