I've followed this guide to install my server: http://www.howtoforge.com/perfect-server-debian-wheezy-apache2-bind-dovecot-ispconfig-3-p4 Now I want to upgrade from PHP 5.4 to PHP 5.6 or at least 5.5. Is there a recommended way of doing that? I'm using the Dotdeb packages so should I add Dotdeb lines for PHP 5.6 in my source list and do a dist-upgrade? Or would it be better to uninstall everything related to PHP and then install PHP 5.6? Or maybe there is another better way?