Ron Dennis retired as McLaren team principal in 2009, handing over to long time McLaren employee Martin Whitmarsh. However, at the end of 2013, after the team's worst season since 2004, Whitmarsh was ousted. McLaren announced in 2013 that they would be using Honda engines from 2015 onwards, replacing Mercedes-Benz. The team raced as McLaren Honda for the first time since 1992 at the 2015 Australian Grand Prix. In September 2017, McLaren announced they had agreed on an engine supply with Renault from 2018 to 2020. McLaren are using Mercedes-Benz engines from the 2021 season until at least 2024.