You edit it in the Operating system and enviroment section in the webmin configuration. https://YOUR SERVER ADDRESS:YOUR SERVER PORT/webmin/edit_os.cgi
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I put webmin on my Asterisk server. Which was running V3.4 of CentOS, I have since upgraded to V3.5 of CentOS.
the top of the webmin page still says "Version 1.220 on asterisk1.local (CentOS Linux 3.4).
Where does it get the version number, and how do I update it.
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You edit it in the Operating system and enviroment section in the webmin configuration. https://YOUR SERVER ADDRESS:YOUR SERVER PORT/webmin/edit_os.cgi