This question already has an answer here:

Today I got Facebook app's update notification.

I thought I forgot to check the automatically update box but I didn't - it is already set for auto already.

So why the app still need our manual update?

marked as duplicate by eldarerathis Apr 13 '13 at 2:28

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    The apps's permissions changed (specifically, new ones were added), so you have to approve the update. – eldarerathis Apr 13 '13 at 2:28