Toto Wolff has said that Mercedes will work hard to maintain their position at the top of the Formula 1 tree.
Lewis Hamilton left Montreal with a second consecutive win, but boss Wolff says that Mercedes's rivals are getting perilously close.
"The pace of Ferrari and Red Bull [in Canada] showed that the competition is right there with us. We need to get everything right in order to maintain our position at the front," Wolff said.
The Austrian said that the Brackley-based team must work "very hard" not only to "make the power unit better", but also so that a major aerodynamic package is debuted "as soon as possible".
Reports suggest that while a major bodywork upgrade was scheduled for Hungary, that is being pushed forward for the British Grand Prix early next month.
That is because Ferrari and Red Bull, having already narrowed the gap, are also working hard.
Germany's Auto Motor und Sport said that Ferrari will spend yet another performance token for its internal combustion engine for Silverstone.
Although big rule changes are coming for 2017, Red Bull are also vowing to continue developing their RB12 throughout the entire 21-race calendar.
"As always, until the end of the season," answered Dr Helmut Marko when asked how protracted Red Bull's 2016 development programme would be.
"It's not as if suddenly the wider cars [for 2017] will turn the aerodynamic laws upside down - many concepts of today can be transferred to 2017.".
Meanwhile, Ferrari's Sebastian Vettel told Bild: "All our improvements so far have proved effective. In a few races we were still a long way from Mercedes, but although it won't be easy, there will come a time when we're in front."
There have, however, been suggestions that Ferrari and Red Bull are pushing the boundaries when it comes to flexible wings, but amid some controversy the cars were deemed legal by the FIA in Canada.
An unnamed engineer told Auto Bild: "All wings move at high speed - this is nothing new."
The 2016 championship continues with the European Grand Prix this weekend.
