Not sure what amount per dependent you think has increased. There have not been any new tax law changes since the stimulus bill for the 2nd stimulus passed in December of 2020, giving people a 2nd stimulus amount of $600.
Congress has not passed any new tax changes since then. If and when they do, we will find out about it and learn how it will be implemented.
Highly doubtful any new changes will apply to the 2020 return at all ... most likely it will be an advance of the 2021 credit but until they decide on anything and it is passed into law AND the IRS figures out how to implement the change we will have to wait and see.