The International Space Station is back to full staffing following the arrival of four astronauts delivered by SpaceX, who will replace colleagues forced to leave early due to health issues.

The launch from Cape Canaveral occurred on Friday, with the astronauts docking with the station 277 miles above Earth the next day.

NASA’s medical evacuation last month marked the first unplanned crew return in 65 years of U.S. human spaceflight. One astronaut from the four-person crew who launched last summer experienced a serious health problem, prompting an early return. The identities and medical details have not been disclosed due to privacy rules.

Until the new arrivals, only three astronauts, one American and two Russians, remained aboard, forcing NASA to pause spacewalks and scale back scientific experiments.

The incoming crew includes NASA’s Jessica Meir and Jack Hathaway, France’s Sophie Adenot, and Russia’s Andrei Fedyaev. Meir and Fedyaev are returning to the station, while Adenot becomes only the second French woman to fly in space. Meir previously participated in the first all-female spacewalk in 2019, and Hathaway serves as a captain in the U.S. Navy. Adenot is a military helicopter pilot.

Upon docking, Adenot greeted the crew with “Bonjour!” and Meir added, “Grateful to be on board, and we’re ready to get to work.”

NASA confirmed that preflight medical evaluations for the new crew were unchanged despite the previous evacuation. The astronauts will remain aboard the station for eight to nine months, resuming normal research and operational activities.