COOL: Elon Musk tells SpaceX employees that its Starship rocket is the top priority now.

SpaceX launched astronauts for the first time barely a week ago but CEO Elon Musk does not want the company resting on its laurels.

Instead, Musk urged SpaceX employees to accelerate progress on its next-generation Starship rocket “dramatically and immediately,” writing Saturday in a company-wide email seen by CNBC.

“Please consider the top SpaceX priority (apart from anything that could reduce Dragon return risk) to be Starship,” Musk wrote in the email.

The Falcon 9 rocket that launched the astronauts is the mainstay of SpaceX’s business, with 85 missions over the past decade. But Starship represents the company’s aim to make obsolete even the cost-saving advances of its Falcon 9 fleet. Its Falcon 9 rockets are partially reusable, as the company often lands the large “booster” stage of the rocket and recovers the rocket’s nosecone. But Musk’s goal is to make Starship fully reusable — envisioning a rocket that is more akin to a commercial airplane, with short turnaround times between flights.

Would-be competitors still trying to match the soon-to-be-obsolete Falcon 9 had better aim higher.