We will be upgrading to PHP 5.4.x on April 13th. We wanted to give you enough notice so you have time to ensure your web apps are ready to support this new version. If Strangecode built your website, you don't have anything to worry about. Otherwise, please refer to php.net's notes on Migrating from PHP 5.2.x to PHP 5.3.x and Migrating from PHP 5.3.x to PHP 5.4.x (we're currently running the latest of the 5.2.x branch, which is EOL, so this is a mandatory upgrade). Most sites should be fine with the upgrade, but if your website is running very old code you should take the recommended precautions in the above links.