I have an iPhone 4s but when I plug it into iTunes it says software is 4.2.1. How can I update to IOS8?

When I plug my iPhone 4s into iTunes it says the software is 4.2.1. How can I update it to IOS8?

Thanks KiltedTim,
Its only a back-up phone but I thought it was a 4S, I could be wrong!
iTunes on syncing Mac is version: 12.1.0.50

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