ROKiT Williams Racing has extended its power unit supply deal with Mercedes-Benz in Formula 1 until the end of the 2025 season.
The Grove-based squad has been powered by the German manufacturer since the advent of the hybrid era in Formula 1 in 2014.
Earlier this summer, rumors had emerged that Williams could switch its engine supply deal from Mercedes to Renault, but the speculation obviously proved wide of the mark.
"We have enjoyed a wonderful partnership with Mercedes-Benz over the past six years of what was originally a seven-year agreement, and so we are delighted to be continuing working with them for a further five years from 2021," said Williams deputy team principal Claire Williams.
"Mercedes-Benz has been one of the sport's most successful engine suppliers and we believe that they will continue to have an extremely competitive engine package going forwards.
"Over our time with them they have become a real friend of the team, and we look forward to working with Mercedes-AMG HPP in future."
Toto Wolff, CEO and Team Principal of Mercedes-AMG Petronas Motorsport added:
"Williams is one of the iconic brands in Formula One and we at Mercedes are proud to count them as part of our motorsport family.
"They have been through some tough times recently but that has only served to demonstrate their resilience and strength of character as they battle back to where they belong on the grid.
"I am certain that the outlook for independent teams is bright under the financial regulations that will be introduced from 2021 and we are delighted to continue our partnership with Williams into that new era of our sport."