A new international agreement on the conservation and sustainable use of marine biodiversity of areas beyond national jurisdiction (BBNJ) was adopted and subsequently opened for signature in September 2023. Yet on average, recent multilateral environmental agreements (MEAs) have taken over four years to move from signature to entry into force, while ocean-focused MEAs have taken nearly twice as long. Rapid ratification of the BBNJ Agreement is crucial for multiple reasons, not least to achieve the Kunming-Montreal Biodiversity Framework target for 30% of the marine environment to be protected by 2030. It is also vital to fulfill the Agreement’s stated ambition to contribute to a just and equitable future for humankind, considering today’s unprecedented expansion of commercial activities into the ocean.