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According to the Australian Immigration page Your passport details have changed:
You can tell us about changes in your passport details in two ways.
Applied online
Select 'Update details' > 'Change of passport details' in ImmiAccount.
Not all details can be updated online in ImmiAccount such as changes to date of birth or gender.
Applied on paper or unable to update online
If you applied on paper or can't update your details online, complete Form 929 - Change of address and/or passport details form (172KB PDF).