You are able to change your Blocked Account details in the Expatrio Portal.
Login to the portal and select Blocked Account and from here you will find Connected current account (for monthly disbursement), then select the green edit icon in the top right corner.
Please provide your new IBAN and BIC. Keep in mind that your monthly disbursements can only be made to the account opened in your name.
Your next monthly payment will be transferred to your new account.