Since 2020 the Japanese sportscar series has used the Class One regulations that were developed jointly with the DTM, and committed to keeping them even after the German series switched to GT3 regulations in 2021.
Originally a new set of rules were due for introduction in 2023, but the onset of the global coronavirus pandemic prompted a one-year freeze and subsequent delay, meaning the current rules will be in use for one more season once the current campaign ends.
