def update(self, ttl=values.unset):
data = values.of({'<STR_LIT>': ttl, })<EOL>payload = self._version.update(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return SyncStreamInstance(<EOL>self._version,<EOL>payload,<EOL>service_sid=self._solution['<STR_LIT>'],<EOL>sid=self._solution['<STR_LIT>'],<EOL>)<EOL>
Update the SyncStreamInstance

:param unicode ttl: Stream TTL.

:returns: Updated SyncStreamInstance
:rtype: twilio.rest.sync.v1.service.sync_stream.SyncStreamInstance