JOINT STATEMENT FROM THE INTERNATIONAL OLYMPIC COMMITTEE AND THE TOKYO 2020 ORGANISING COMMITTEE: In the present circumstances and based on the information provided by the WHO today, the IOC President and the Prime Minister of Japan have concluded that the Games of the XXXII Olympiad in Tokyo must be rescheduled to a date beyond 2020 but not later than summer 2021, to safeguard the health of the athletes, everybody involved in the Olympic Games and the international community.
https://www.olympic.org/news/joint-statement-from-the-international-olympic-committee-and-the-tokyo-2020-organising-committee
https://tokyo2020.org/en/news/joint-statement-from-international-olympic-committee-and-tokyo2020