WP 2.2 is a mandatory upgrade for 2.1.3 users
Just a quick point of clarification. 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.
The good news is that although a lot of under-the-surface code changed in 2.2, it’s not jarringly different from a usage standpoint. So if familiarity was holding you back from upgrading, it shouldn’t be.

[...] for a week or two. Looks like I’ll have to change my plans and upgrade right away because Mark Jaquith, one of the lead brains behind WordPress writes that WordPress 2.2 is a mandatory security upgrade [...]
Wordpress 2.2 is Mandatory Upgrade! [Update Now]
May 22, 2007 at 1:03 pm
[...] now, the news has spread rapidly in security circles and on mailing lists about an exploit to the WordPress software less than or equal to version 2.1.3. To give you some background, we had [...]
Guide to Disaster: How The Tech Team Handled WordPress Security Flaw
May 23, 2007 at 3:10 am
Thank you for making this known.
carthik
May 23, 2007 at 6:10 pm
[...] Jaquith of Mark on WordPress clarifies that there will be no further releases in the 2.1.x branch. 2.2 includes security fixes [...]
WordPress 2.2 Is Now a Mandatory Upgrade « Sabahan.com
May 24, 2007 at 1:33 am
[...] Mark Jaquith (one of TPTB@WordPress) released a post that says 2.2 is a mandatory upgrade if you’re currently using 2.1.3, although there’s no explanation as to [...]
WP Mandatory Upgrade : Cornell Finch
May 24, 2007 at 7:59 am
[...] finally upgraded both blogs to WordPress 2.2 after the imminent threat of destruction loomed. I was previously using the sidebar widget, and it’s nice to see them included in the [...]
Blog Changes
May 24, 2007 at 8:57 pm
[...] Mark Jaquith has released a post a little while back letting all the WordPress 2.1.x users know that WordPress 2.2 means the end of the 2.1.x branch. There will continue to be security updates for 2.0.x but if you want to keep moving forward with the latest and greatest in WordPress, you need to get WordPress 2.2. [...]
WordPress 2.2 is Mandatory for 2.1.x Users by Blogging Pro
May 25, 2007 at 3:40 pm
[...] Mark Jaquith has released a post a little while back letting all the WordPress 2.1.x users know that WordPress 2.2 means the end of the 2.1.x branch. There will continue to be security updates for 2.0.x but if you want to keep moving forward with the latest and greatest in WordPress, you need to get WordPress 2.2. [...]
WordPress 2.2 is Mandatory for 2.1.x Users - Money Making Blog How To
May 25, 2007 at 4:44 pm
[...] want to reconsider. Mark Jaquith, one of the WordPress developers has explained on his blog that 2.2 includes mandatory security fixes. WordPress 2.2 is a mandatory security upgrade for WordPress 2.1.3 users. There will be no further [...]
Wordpress 2.2 Includes Security Fixes
May 25, 2007 at 6:05 pm
[...] avisando que, se o Mark Jaquith, um dos bam-bam-bams do WordPress, disse que o único caminho para quem está com WordPress 2.1.x é fazer o upgrade para 2.2, fazer o quê? Ainda bem que o updater do 2.2 é inteligente, reconhece se você tem instalado o [...]
Calendários e upgrades - Fudeblog by Cesar Cardoso
May 25, 2007 at 11:36 pm
[...] It’s not an option, but a mandatory security fix. [...]
Time to Upgrade at Chris M. Lindsey
May 26, 2007 at 1:02 am
[...] wanted to wait a while before upgrading to WordPress 2.2 but with the news that it is a mandatory update I decided to go ahead with the upgrade. I would suggest that all other WordPress 2.1.x users [...]
Have You Upgraded to Wordpress 2.2? | PureBlogging
May 27, 2007 at 1:17 am
Along with the bug fixes, WordPress 2.2 brings new bugs to the table: wp_mail removes the Content-Type, you can’t remove widgets in Firefox and all widgets are used by default… etc. You can check the bug list at trac.wordpress.org
The official install guide is quite hard to understand so i decided to write a tutorial with pictures about how to upgrade to wordpress 2.2 and i allso describe the compatibility issues on widgets.
WordPress
May 28, 2007 at 2:44 am
[...] So it was a good a time as any to upgrade to WordPress 2.2. Not that the WordPress folks give those still on 2.1.3 much choice. [...]
A View from Home » WordPress 2.2
May 28, 2007 at 12:59 pm
[...] send it to me so that I could provide the rest of us with 2.1.3 instead of 2.1.2. Do note that the WordPress community won’t be providing further release in the 2.1 branch number. Then perhaps they should reconsider that preview in a new tab feature or probably make it an [...]
I’m staying with Wordpress 2.1, so should you! — BlogoSquare
May 29, 2007 at 1:53 am
[...] 2.2 Posted By: Moses Published in Announcement, Plugin, WordPress, Blogs, Bloggers 1Jun Mark Jaquith has reported that WordPress 2.2 is a mandatory security upgrade for WordPress 2.1.3 users. There will be no [...]
Wordpress 2.1.3 Users MUST Upgrade to 2.2 at WPThemesPlugin.com - Wordpress Themes | Plugins | Blog Tools | Interviews | Make Money Online
May 31, 2007 at 8:00 pm
[...] wp2.3, especially the tagging and the revamp draft filtering in the admin. Oh btw, any of you read this? __________________ Don’t Ask Me Why I Joined This Forum GeminiGeek’s Online [...]
Got WordPress blog? Have you upgraded? - Webmaster Malaysia Forum
June 1, 2007 at 10:40 am
I’ve been using WP 2.2 for the last few days and honestly, from an author’s standpoint, I can hardly see any difference!
I know there’s been a lot of work “under the hood” but upgrading from 2.1.3 has been painless… for me, at least.
Claude Gelinas
June 1, 2007 at 9:17 pm
[...] WordPress fixes a problem that could allow hackers to determine the WordPress administrator password [...]
Updates: PHP 4, PHP 5, ClamAV, XFree86, WordPress | Tiger Technologies Blog
June 6, 2007 at 2:53 pm
[...] 在《WP 2.2 is a mandatory upgrade for 2.1.3 users》一文中說明 2.1.3 應該要升級成 2.2 的理由,很簡單: WordPress 2.2 is a [...]
短命的 WordPress 2.1.3 « Kirin Lin
June 11, 2007 at 10:29 am
Goeie dag!
Check this out!
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Mario_gs
June 11, 2007 at 11:35 am
And some more..
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Cristian_py
June 11, 2007 at 11:35 am
[...] “WP 2.2 is a mandatory upgrade for 2.1.3 users” by Mark Jaquith, [...]
Marco Luthe Online! » Blog Archive » Lorelle’s “Wordpress Wednesday News” From 2007-06-06
June 12, 2007 at 4:58 pm
[...] are using WordPress 2.1.3, WordPress 2.2 is a mandatory upgrade, according to WordPress developer, Mark Jaquith. WordPress 2.2 is available for download and you can find a list of version changes and new [...]
WordPress Wednesday News: Two Exciting WordPress Competitions, Lots of WordPress Plugins News, Hot Blogs Moving to WordPress, and Andy Skelton Riding a Motorcycle to WordCamp : The Blog Herald
June 13, 2007 at 5:01 pm
[...] the “mandatory upgrade” of WordPress 2.2 has been out for some time now, it seems many people are still quite [...]
WordPress 2.2.1 out soon and current issues with version 2.2
June 19, 2007 at 2:16 pm
[...] caso vi fosse sfuggito, WordPress 2.2.x è un mandatory upgrade per gli utenti della versione 2.1.x. Tradotto ai minimi termini: la versione 2.1.3 non verrà più [...]
pseudotecnico:blog » Wordpress 2.1.1
June 25, 2007 at 1:57 pm
[...] versione è definita mandatory upgrade per gli utenti della versione 2.1.3. Questo significa che la versione 2.1.3 non verrà più [...]
WordPress 2.2.1 » StormedBrains
June 25, 2007 at 2:27 pm
[...] WordPress 2.0.x as the site engine. I was thinking of upgrading to 2.1.x but I stumbled upon this post, that states that the 2.1 version won’t get any updates. Therefore, I took the plunge and [...]
Apostolos Dountsis » Site Updated To WP2.2.2 and Widgets
August 11, 2007 at 4:41 am
Mark, will you provide patches for 2.2.2 -> 2.2.3?
jimisola
September 13, 2007 at 6:29 am
[...] WP 2.2 is a mandatory upgrade for 2.1.3 users ” Mark on WordPress [...]
Months of waiting to make money online! | Feed Flare
July 24, 2008 at 11:13 am