def update(self, role_sid=values.unset,<EOL>last_consumed_message_index=values.unset,<EOL>last_consumption_timestamp=values.unset, date_created=values.unset,<EOL>date_updated=values.unset, attributes=values.unset):
return self._proxy.update(<EOL>role_sid=role_sid,<EOL>last_consumed_message_index=last_consumed_message_index,<EOL>last_consumption_timestamp=last_consumption_timestamp,<EOL>date_created=date_created,<EOL>date_updated=date_updated,<EOL>attributes=attributes,<EOL>)<EOL>
Update the MemberInstance

:param unicode role_sid: The SID of the Role to assign to the member
:param unicode last_consumed_message_index: The index of the last consumed Message for the Channel for the Member
:param datetime last_consumption_timestamp: The ISO 8601 based timestamp string representing the date-time of the last Message read event for the Member within the Channel
:param datetime date_created: The ISO 8601 date and time in GMT when the resource was created
:param datetime date_updated: The ISO 8601 date and time in GMT when the resource was updated
:param unicode attributes: A valid JSON string that contains application-specific data

:returns: Updated MemberInstance
:rtype: twilio.rest.chat.v2.service.channel.member.MemberInstance