The new €20 note will start appearing from ATMs tomorrow.
It's the latest note to get updated, with a new look and new ways to spot a fake.
The note follows the 5 and 10 in the Europa series of banknotes with enhanced security features.
Alongside the old note, the note will be legal tender from tomorrow, and you’re likely to take it out of an ATM soon.
The Central Bank says the note has a see-thru window in the upper right hand corner, which it says is "the first note with such a feature in it".
