The Toro Rosso team confirmed on Friday it will use year-old Ferrari engines during the 2016 Formula 1 season.
The move had been expected for some time, but it was only earlier this week that FIA approved a rule change that allows the Italian squad to return to Ferrari power units.
Manufacturers were unable to run two types of engines before the FIA rule change this week.
Toro Rosso will use the latest spec of the 2015 Ferrari engines next season, while sister team Red Bull will stay with Renault power units but badged TAG Heuer, as revealed earlier on Friday.
Faenza-based Toro Rosso used Ferrari power from 2007 to 2013, before switching to Renault units for the past two seasons.
The team finished the 2015 season in seventh place with 68 points, but its car was regarded as one of the best from an aerodynamic point of view.
Toro Rosso has also confirmed Max Verstappen and Carlos Sainz will be retained.
"It's great to be working with Ferrari again," said team boss Franz Tost. "We had a fruitful relationship in the past and I'm sure it won't take long for us all to be working together very well again.
"It's true that time will be very tight for us to be ready for the first test, but we have the right team of people for this and I'm confident that together we will achieve a competitive package for next year – bring on 2016!"
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