The two founders jousted for years. This week, they found each other on X while their rocket companies launched missions with mixed results.

Blue Origin’s New Glenn rocket has successfully blasted off into orbit for the first time, marking an important milestone for Amazon founder Jeff Bezos as he seeks to rival Elon Musk’s SpaceX.

Elon Musk and Jeff Bezos, two tech moguls who have spent years battling it out for supremacy in the space race, seem to have buried the hatchet—at least, publicly. Their friendly exchange on social media following the results of their respective rocket launches marks a possible end to their long-standing rivalry.