Williams will have new front and rear wings on its cars for the German Grand Prix as it pushes to try and get back into the points after its tough first half of the season.
The team has only scored four points so far this year, via ninth places in Monaco and Valencia. Technical director Sam Michael said the upgrades for the Nurburgring would be significant.
"We have a new rear wing, front wing and revised engine mapping for the exhaust blowing on over-run that has now been reinstated," he said.
Williams showed promise in practice and qualifying at Silverstone, with Pastor Maldonado taking seventh on the grid, before fading badly in the race and coming away with only 13th and 14th places. But Rubens Barrichello was confident that the improvements Williams showed at the start of the weekend were real, and that the Nurburgring could bring better results.
"We made a step forward in the qualifying," he told AUTOSPORT. "We would have had two cars in the top 10. The race pace wasn't there but with a little bit of luck, we would have finished in the top 10 today.
"I'm still not happy with the whole car balance situation, because it was a lot of new parts for here we've learned a great deal this weekend. So there will be some fine tuning for the next race."