def update(self, style_sheet=values.unset):
data = values.of({'<STR_LIT>': serialize.object(style_sheet), })<EOL>payload = self._version.update(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return StyleSheetInstance(self._version, payload, assistant_sid=self._solution['<STR_LIT>'], )<EOL>
Update the StyleSheetInstance

:param dict style_sheet: The JSON Style sheet string

:returns: Updated StyleSheetInstance
:rtype: twilio.rest.preview.understand.assistant.style_sheet.StyleSheetInstance