Sorry to say Apple does not offer a newer iOS for your iPad.
Its rumored the next major release of iOS will be dropping the iPad 2 (Fall '15) which is why Apple just dropped the iPad 2 and sells in its place the iPad 4th gen. model which it just brought back into the lineup.
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While some have managed to make it work (hacked) its not worth the effort.
Sorry to say Apple does not offer a newer iOS for your iPad.
Its rumored the next major release of iOS will be dropping the iPad 2 (Fall '15) which is why Apple just dropped the iPad 2 and sells in its place the iPad 4th gen. model which it just brought back into the lineup.