update iphoto 8.1.2

Hi everyone!

Recently, I have installed mountain lion in my MacBook Pro (Middle 2009). Now, I would like to activate streaming in iphoto with icloud, but I need to update iphoto. I have the version 8.1.2 and I have find iphoto 9.1 update but it need first the version 9.0 and I can't find it. How can I solve this problem?