You can update iPhoto '11 in the Updates tab of the Mac App Store, if any of the following are true:
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- You are running OS X Mountain Lion. 

- You installed iPhoto '11 from the Mac App Store. 

- Your computer came with OS X Lion or later installed. 

You can update iPhoto '11 by clicking on the Apple () menu and choosing Software Updates, if any of the following are true:
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- You installed iPhoto '11 from an iLife '11 installation DVD. 

- Your computer came with iLife '11 and Mac OS X v10.6.8 or earlier installed. 

Note: You may need to update OS X to the latest available version before you can update iPhoto.
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- In OS X Mountain Lion, the OS X update will be available in the Updates tab of the Mac App Store. 

- In OS X Lion and earlier, the OS X update will be available in Software Updates.