He who hesitates is lost. To respond to the extensive upgrades introduced in Miami by rival teams, Mercedes—the absolute leader of this early season with four victories out of four Grands Prix—arrived in Canada with its first major package of aerodynamic and mechanical developments. “It’s a world championship that will be decided primarily on upgrades,” Kimi Antonelli reiterated yesterday, “because the development curve of the cars under these new regulations is very steep, and our rivals got quite close in Miami, so we have to respond.”
The responses arrived right on cue thanks to tremendous effort by the British squad across the entire car, a project conducted during April’s month-long break and finalized between Miami and Montreal. This resulted in eight modifications made to the car, affecting the front wing, the floor, and the rear end of the W17. Montreal also marks the debut of Mercedes’ new software, one of the solutions engineered by the team to improve race starts—the Silver Arrows’ true Achilles’ heel at the start of this season.
Antonelli himself spoke out on the modifications implemented: “In addition to the software, which has been heavily worked on since Miami, this weekend we also have a new clutch paddle. We made a modification in this area, so let’s see if this will help us get some decent starts over the weekend.” Time to test this significant development package was restricted to the first and only free practice session of the Sprint format weekend. Despite the limited running, the Mercedes cars flew to first and second positions, with Antonelli leading teammate George Russell.
What the rivals brought to Montreal
The championship leaders were not the only ones to bring major updates to Canada ahead of the European leg of the season, which kicks off in two weeks with the Monaco Grand Prix. Mercedes’ eight modifications are closely followed by the seven introduced by McLaren. As scheduled, the Woking squad finalized the development package in Montreal that it began in Miami, where Andrea Stella’s team had registered a significant step forward in competitiveness.
Haas brought five developments, followed by four from Red Bull—another team that had already turned up in Miami with profound car revisions. Audi and Racing Bulls also introduced four new features each, while Williams paused at three, and Alpine and Cadillac brought two. Consequently, only two teams chose not to introduce any upgrades this weekend: Aston Martin and Ferrari. For the Maranello-based team, the goal of the weekend is to optimize the Miami package without adding further innovations. As always, the track will provide the ultimate answers.
Mercedes’ proactive approach in rushing an extensive eight-part development package to Canada highlights the relentless nature of the 2026 development war. By directly targeting their start-line weakness with a combination of new software and a redesigned clutch paddle, Brackley is leaving no stone unturned to protect their unblemished win record. While McLaren and Red Bull continue to pile on the pressure with their own technical updates, the engineering breakthroughs hidden beneath the skin of the W17 could well be the deciding factor in maintaining Mercedes’ supremacy as the grid heads toward Europe.
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