db_version in sys_config not chnaged afer dbispconfig is altered

when ispconfig is updated and database altered, there is still same db_version record in table sys_config

my both server are now on 3.0.4.1 but the records are still same like in time of installaltion server1: +-----------+-------+------------+---------+ | config_id | group | name | value | +-----------+-------+------------+---------+ | 1 | db | db_version | 3.0.2.2 | +-----------+-------+------------+---------+ 1 row in set (0.00 sec)

server2: +-----------+-------+------------+-------+ | config_id | group | name | value | +-----------+-------+------------+-------+ | 1 | db | db_version | 3.0.3 | +-----------+-------+------------+-------+ 1 row in set (0.00 sec)