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

:param unicode ttl: Alias for collection_ttl
:param unicode collection_ttl: Time-to-live of this List in seconds, defaults to no expiration.

:returns: Updated SyncListInstance
:rtype: twilio.rest.sync.v1.service.sync_list.SyncListInstance