The Code rules were amended by the IOC
The Anti-Doping Rules were revised to the postponed Tokyo 2020 Games. The WADA posted its rules at the request of the International Olympic Committee (IOC). The WADA attached to its post the general IOC’s Anti-Doping Rules (Rules) with accompanying circular letter which are applicable to the re-scheduled Olympics Games Tokyo 2020 (2020 Games) taking place in July and August 2021.
The World Anti-Doping Code (Code) which is applicable to the Games was amended by the IOC to be in line with 2021 Code and International Standards which are now in force and that will apply to the re-scheduled 2020 Games.
The List of Prohibited Substances and Methods was came into force on 1 January 2021.
The Rules will cover the whole period of the 2020 Games from its opening day on July 13 until the day of the closing ceremony on 8 August 2021.
During the period of 2020 Games, all athletes will be subject to doping controls implemented by the WADA.
The source of that article is on wada-ama.org. The detailed rules can be found in the World Anti-Doping Code.