2.2.3 is a security and bug-fix release for the 2.2 series. Since this is a security release, we suggest you upgrade immediately. Two of the fixes are high priority.

$ svn info
Path: .
URL: http://svn.automattic.com/wordpress/tags/2.2.2
Repository Root: http://svn.automattic.com/wordpress
Repository UUID: 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Revision: 5946
Node Kind: directory
Schedule: normal
Last Changed Author: matt
Last Changed Rev: 5850
Last Changed Date: 2007-08-04 22:43:11 -0700 (Sat, 04 Aug 2007)

$ svn sw http://svn.automattic.com/wordpress/tags/2.2.3
U    wp-includes/default-filters.php
U    wp-includes/plugin.php
U    wp-includes/query.php
G    wp-includes/formatting.php
U    wp-includes/feed-rss2-comments.php
U    wp-includes/rewrite.php
U    wp-includes/version.php
U    wp-includes/pluggable.php
U    wp-includes/widgets.php
U    wp-includes/rss.php
U    wp-includes/vars.php
U    xmlrpc.php
U    wp-mail.php
U    wp-admin/admin-ajax.php
U    wp-admin/admin-functions.php
U    wp-admin/rtl.css
U    wp-admin/options.php
U    wp-admin/install-rtl.css
U    wp-admin/widgets-rtl.css
Updated to revision 6065.
$

Done.

More info on how to here: Installing/Updating WordPress with Subversion