WordPress Update V 2.6.2 to avoid vunerabilites in the SQL random number generation string.
“The latest stable release of WordPress (Version 2.6.2) is available in two formats from the links to your right. If you have no idea what to do with this download, we recommend signing up with one of our web hosting partners that offers a one click install of WordPress or getting a free account on WordPress.com.”
Visit this page for more details on the new version:
Also try this handy plugin to automatically upgrade WordPress, it certainly takes the pain out of the process.