My Joomla 3 site is not showing the available update
From Joomla! Documentation
Revision as of 00:04, 8 February 2013 by Elin
If your Joomla 3.0.x site is not showing the available update in the Joomla! Update component, then within the component, click on Options (button top-left) and make sure that the Update Server is set to Short Term Release.