Red Bull Racing and Mercedes seem to have opted for security. The decision will not result in any grid penalties for the drivers, as the change will be made by both teams within the regulations.
"Both drivers used their previous gearbox for six consecutive events, in accordance with Article 23.4a of the 2021 Formula 1 Sporting Regulations," reads the explanation to the message.
Verstappen and Hamilton get new gearbox
According to the rules, a gearbox must be used for at least five consecutive race weekends. A race weekend in this case means the third free practice, qualifying and the race. If the part is replaced prematurely, the driver will receive a grid penalty of five places.