The new Law reads:
38.3.1 At any time from the moment the ball comes into play until the instant when the bowler would normally have been expected to release the ball, the non-striker is liable to be Run out if he/she is out of his/her ground. In these circumstances the non-striker will be out Run out if he/she is out of his/her ground when his/her wicket is put down by the bowler throwing the ball at the stumps or by the bowler’s hand holding the ball, whether or not the ball is subsequently delivered.
38.3.1.1 The instant when the bowler would normally have been expected to release the ball is defined as the moment the bowler’s arm reaches the highest point of his/her normal bowling action in the delivery swing.
38.3.1.2 Even if the non-striker had left his/her ground before the instant at which the bowler would normally have been expected to release the ball, once the bowler has reached that point it is no longer possible for the bowler to run out the non-striker under this Law.

Laws 38.3.2 and 38.3.3 remain unchanged.

This becomes Law immediately, and is in effect from January 19th 2023. Because this is not a material change to the meaning of the Law, MCC will not be re-printing Law books, but the change has already been reflected in all online materials.