Kimi Raikkonen says the atmosphere at Ferrari is better than it was 12 months ago after a series of changes in the team ahead of 2015.

After a disappointing 2014 campaign, Ferrari won three races this year and finished second in the constructors' championship to Mercedes. The team also underwent a series of changes towards the end of 2014, including the appointment of new team principal Maurizio Arrivabene and Sebastian Vettel replacing Fernando Alonso as Raikkonen's team-mate.

"The year has finished and obviously for the next year people always expect more than the team did this year, but it's always different," Raikkonen said. "There were some new people and the atmosphere overall has been very good in the team this year compared to the previous year and obviously that's normal for us. For the Christmas everybody seems to be more happy. Obviously a long season is finished and soon everybody gets some time off, there is a relaxed feeling."

However, Raikkonen said it is still too early to know whether Ferrari will be able to challenge for the title next year.

"Obviously we all know where we want to be as Ferrari, Ferrari wants to win and it will not be easy, I mean, there are a lot of strong teams and all of them have the same idea of winning races and championships. Obviously, having done better this year, we have more expectations for the next one, but we are here for winning races, to win championships, so we will give our 100% to try to bring back the championship for Ferrari, but it's too early to say.

"We can do our best but we can't control what the others do, so we have to keep working the same way, always improving, then we will see where we end up in the next year. There's no point to start guessing, we have to wait until the winter tests and the first race."