Do I need to notify hmrc?

[Emzerness]

Hello,
Currently claiming child tax credit and child benefit.
Had a new bank card sent to me because of suspected fraudulent the by someone.
My actual acount number is exactly the same so would the ctc and cb still get paid into it as normal or do I still need to notify them because the 16 digit number has changed? Have tried looking online but still none the wiser.

That'll be fine. As long as your account number has stayed the same , the long card number won't make a difference.

Your bank account number and sort code will be exactly the same, it is only a new card number you have which you don't need to inform Hmrc about