How to update my Iphone 3GS's software?

I recently bought a used Iphone 3GS and it shows that it is ios4.2.1. I would like to update to ios5 so I can get different apps, but I'm not sure how to. When I go to settings>general, there's no software option, so I'm not sure about that. Is there a way to update it through Itunes?

1. Download the latest version of iTunes: apple.com/uk/itunes.
2. Plug your iPhone into your Mac or PC.
3. Click your iPhone in the bar just below the top of the window.
4. Click 'check for updates'.
N.B: Usually, iTunes will notify you of the fact that there are updates available for your iPhone.

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