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Red Bull has announced that Sebastian Vettel will leave the squad at the end of the season.
The four-times world champion has been with the team since 2009 but will depart following the Abu Dhabi Grand Prix, where he is set to switch to Ferrari, in place of McLaren-bound Fernando Alonso.
Red Bull will replace Vettel with Toro Rosso youngster Daniil Kvyat.
"It is a big step and hard to make such a decision," Vettel said.
"The chance to drive in F1, the first win with Scuderia Toro Rosso, the four championship wins with Infiniti Red Bull Racing and many other great memories have bound Red Bull and myself together into a kind of family. No one can take these times away from us.
"I would like to express big thanks to [Red Bull owner] Dietrich Mateschitz, [team advisor] Dr Helmut Marko, [team principal] Christian Horner, the whole Red Bull family, Infiniti Red Bull Racing and Scuderia Toro Rosso.
"I would like to thank everybody within Red Bull for their confidence in me, trust and great support over the last years."
