Should I update my iTunes even though i still have iOS7?

I have an iPhone 4 so I can't get iOS8. But lately iTunes has been sending me messages asking if I want to update, but they're all meant for iOS8. I don't want to download it and have it mess up my phone somehow. But at the same time there are security updates that are usually important. So what should I do?

I don't think you have to update, but you could google a list of all of the features and see if any are important

I'm running iOS 7 device, iOS 5 device and the latest version of iTunes for Windows. There's no problem at all. There's nothing to worry about.

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