Elon Musk said SpaceX's first-ever civilian crew had 'challenges' with the toilet and promised an upgrade for the next flight

• Elon Musk said the next SpaceX civilian mission would have a better toilet.
• SpaceX successfully completed its first all-civilian mission, Inspiration4, last week.
• Musk said on Twitter that there had been "challenges" with the toilet, without elaborating.

Elon Musk said on Twitter that SpaceX plans to upgrade the amenities for its next space-tourist flight, including the toilet.

The Inspiration4 crew, made up of four civilian astronauts, $4 aboard SpaceX's Crew Dragon spacecraft. They $4 on Saturday evening.

Elon Musk tweeted on Monday that he met the crew in person in Florida, and then he answered questions from Twitter users about the company's plans for the next mission.

Responding to one user, Musk $4 the next flight would have "upgraded toilets." He added, "We had some challenges with it this flight."

-Elon Musk (@elonmusk) $4

The billionaire did not elaborate on what these challenges were or how exactly the toilets would be upgraded.

Jared Isaacman, one of the passengers on Inspiration4, told $4 in July that the toilet for Crew Dragon was located on the ceiling of the spacecraft and featured a glass dome, meaning crew members $4 while using the bathroom.

"It's not a ton of privacy. But you do have this kind of privacy curtain that cuts across the top of the spacecraft, so you can kind of separate yourself from everyone else," Isaacman said.

Isaacman added that learning to use the toilet on the spacecraft was part of the civilian astronauts' rigorous preflight training.

Musk also $4 the next flight would have a small oven for heating food, as well as WiFi provided by $4, SpaceX's satellite-internet project.

-Elon Musk (@elonmusk) $4

The crew for the Inspiration4 mission took $4 on its three-day flight. While in space, the crew members chatted with Musk and the $4.