From Webuzo Wiki
The Update tab in the Admin Section allows to update Webuzo to the latest version.
You can update Webuzo in two ways : 1) From the Admin Panel : The '''Updates''' Tab displays updates if any and also the '''Change Log''' for the current version of Webuzo
Click on the '''Update Webuzo''' button to update Webuzo to the latest available version. Thats it you are done.
2) Webuzo can also be updated from the COMMAND LINE. The following as well updates Webuzo to the Latest version if available:
[root@host ~]# php /usr/local/webuzo/cron.php