These are the 2014 revised editions. If you bought earlier versions, here's your chance to get a re-edited edition, for free, and without 'writing over' your old copies.
The above picture contains a link to the Amazon-USA website. If you are from another country, please check your local Amazon website.
The next book in the series is Not Exactly Allies, followed by Decidedly Not Official, and Not Quite Home (available now for preorder at Amazon in a Kindle edition).