Williams has confirmed that it will retain both Valtteri Bottas and Felipe Massa for the 2016 season.
Bottas made his Formula 1 debut with Williams in 2013 and will remain with the squad for a fourth successive campaign.
Massa joined Williams at the start of 2014 after a decade associated with Ferrari and will also be kept on for what will be his 14th year in the sport.
"I am really pleased to be staying with the team for a fourth F1 race season," said Bottas.
"We have been getting stronger as a team and I look forward to what next year will bring, as I believe we can achieve even stronger results than what we have seen so far.
"I can’t wait for 2016, however I am still fully focused on this season as we still have plenty of challenges to achieve."
Massa added: "I am very happy to be a part of the Williams family. I am in my second year here and am so pleased to be staying as we are working very well together as a team.
"They respect me a lot and the results are there, and it has been so nice to be part of the big turnaround the team has seen since the end of 2013."