Only if you have iOS 5 or later.
Your Tag states you have iOS 4... so... No... you cannot update without a computer.
For iOS 4... See Here...
http://support.apple.com/kb/HT4972
OR...
Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch
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