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The Joomla Project announces the immediate availability of Joomla 1.6.4. This is a security release. This release corrects four security issues and fixes an issue relating to version upgrades. Note that the upgrade to version 1.6.4 should be done before upgrading to version 1.7.0 (due out in July).

http://www.joomla.org/announcements/rel ... eased.html

Discuss about the release of 1.6.4 here: http://forum.joomla.org/viewtopic.php?f=9&t=631624