2016 Indian banknote demonetisation
On 8 November 2016, the Government of India announced the demonetisation of all ₹500 and ₹1,000 banknotes of the Mahatma Gandhi Series. It also announced the issuance of new ₹500 and ₹2000 banknotes in exchange for the demonetised banknotes.
Source: Wikipedia — 2016 Indian banknote demonetisation (CC BY-SA 4.0)