Well, you usually have to receive Android operating system upgrades from your carrier. If they haven't created and pushed one out to you, then there's probably not a stock one available (guessing that's the case since you're running a bit of an older version of Android, 4.0.3--if you haven't received one by now, there's probably not one available).
There are sometimes custom ROMs (versions of Android) that enterprising developers have created, but installing these typically takes a bit of knowledge and effort and the ability to root your device--quite an undertaking. These are also very developer- and device-dependent.
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