On December 12, 2023, the new regulations regarding stumping appeals and concussion substitutes went into force. The playing circumstances have been significantly altered by the International Cricket Council (ICC). Specifically, umpires will now only evaluate side-on replays for stumping; they will no longer take the caught-behind situation into account when making referrals to the Decision Review System (DRS). The change went into effect on December 12, 2023, and as a result, a team will now need to execute a DRS option for the caught-behind appeal separately if it wishes to refer to caught-behind during a stumping.Australian wicketkeeper Alex Carey frequently used review for caught-behind following a stumping in the series against India early in the previous year, avoiding using the team's DRS option.The umpires will now solely take into account the visuals from the side-on camera when considering a stumping appeal; they will not be checking for a snick.The ICC's latest amendment said that "the change restricts a stumping review to only check for stumped, preventing the fielding team a free review for other modes of dismissal (i.e., caught behind) without choosing a player review."Additionally, the ICC has clarified the concussion replacement regulation. Now, if the replacement player was suspended from bowling at the time of the concussion, the substitute player will not be allowed to bowl.