Google is in the process of updating pagerank now.

Great! It's happened again! is now updating publically available pagerank!
The update can take from several days and up to several weeks, so you might see some pagerank "jumps" up and down during the update, as well as some different page rank values shown by toolbar and by any other tools, including our PRchecker tool.
To celebrate this update we have added a new PR icon to our page rank checking tool, the very desirable blog-style button, that looks like this:
And sure, wishes you the highest values of pagerank for all your web pages.