Mark Jaquith has reported that WordPress 2.2 is a mandatory security upgrade for WordPress 2.1.3 users.

There will be no further releases in the 2.1.x branch. 2.2 includes security fixes that 2.1.3 lacks, so your only upgrade path is to 2.2.

But before you upgrade please take note that some plugins won’t work anymore, these include Plugins which rely upon old table structures and global functions. For example, the Ultimate Tag Warrior, Customizable Post Listings, More Smilies, podPress, and other Plugins which modify the_content() template tag and rely on deprecated structures and functions

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