i am tray to upload my IPA app to ios app store but i get this error
ERROR ITMS-90725: Please update Xcode and rebuild your app
ERROR ITMS-90725: "SDK Version Issue. This app was built with the iOS '10.3' SDK. All new iOS apps submitted to the App Store must be built with the iOS '11.0' SDK or later, included in Xcode [9.0] or later. Please update Xcode and rebuild your app."
how to solve this problem please
Have you try like displayed in the warning respectively have you try to update XCode?
thanks but i need help for free 
I understand the frustration, but to be fair, mac os 10.13 is more than one years old, on the other side for security and bug reason I could understand that apple want its user to upgrade at some point too
thanks you all , i updated mac os to latest version and now i can upload my app to app store 

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