The Milton Keynes based team has claimed the previous three world titles.
"The 2012 season was tough and long, but our success was testimony to all the hard work and dedication in the factory," said Horner.
"We’re fortunate that we’ve been able to maintain continuity within our group. This is the fifth year that this driver pairing has been together. We’ve got continuity throughout all of the technical teams and all the key areas. I think that’s proof that there is a fierce determination to keep both of those trophies in the cabinet for another year."
Reigning world champion Sebastian Vettel added that he is eager to return to action.
"I’m excited to get going again, to get back in the car, start testing and then go racing. Then, we’ll finally find out where we are," he said.
Team mate Mark Webber admits it's difficult to believe that 2013 will be his seventh season with Red Bull.
"I couldn’t have envisaged it when I joined and it’s hard to believe that you could be with the same Formula One team for seven years, as continuity is not always easy to achieve in this sport."
Webber will début the RB9 in Jerez on Tuesday. Vettel takes over on Thursday.