Marcus Ericsson says Sauber's new owners have allowed the team to increase its development, as it bids to recover from a dismal first half of 2016.
Sauber has yet to score a point and props up the Constructors' Championship, with the C35-Ferrari featuring only minor updates since pre-season testing in March.
Ericsson is confident that Sauber's acquisition by Longbow Finance will boost the team's prospects when the sport returns from its summer break, after negotiating this weekend's German Grand Prix.
"We've had a development plan in the loop for quite a long time," he said.
"Obviously now, with the new owners, they've been pushing that a bit more.
"So hopefully after the summer break we will see some more new parts on the car, and hopefully that will help us improve a bit."
Sauber will continue to evaluate a new rear wing at Hockenheim.
"We’ve been gathering numbers for the guys back in the factory to make sure they are working in the correct way when we use them, now we are quite confident that they will work this weekend, so we will try in FP1," he said.