The Australian had originally been committed to McLaren until the end of 2024, having been lured away from an Alpine reserve role last year with the promise of a race seat.
But after a strong debut season as team-mate to Lando Norris, McLaren announced on Wednesday that the Australian would stay on board for at least an extra two years.
Speaking about his new deal, Piastri said: “I am thrilled to be extending my partnership with McLaren for many years. I want to be fighting it out at the front of the grid with this team and I am excited by the vision and foundations that are already being laid to get us there.
“The welcome that I have received and the relationships that I have built make this feel like home already.
“The team’s consistent commitment in me has made me feel incredibly valued and the desire from the team for me to be part of its long-term future made this an easy decision. To be wanted like that and for the team to show so much belief in me after just half a season, means a lot.”
Source: Autosport