To monitor the ocean and understand its impact on climate, the international Argo program has operated >4,000 temperature/salinity profiling floats in the world’s oceans since 2000. Global from the surface to the ocean bottom (Deep-Argo), and fully multidisciplinary with 6 essential biogeochemical variables (BGC-Argo), the Argo program is now entering a new phase to meet the challenges imposed by climate change. Argo-2030 has two main objectives. First, to acquire standard BGC-Argo floats to consolidate the French contribution to BGC-Argo. Second, to prepare Argo’s next phase by testing and validating a new generation of BGC- and Deep-Argo floats that will dramatically increase the scientific potential of Argo. The BGC-ECO-Argo floats will be equipped with innovative ecological sensors to extend Argo’s scope to marine ecological research. Systematically equipped with oxygen sensors, the Deep-6000 floats will enable to investigate the role of the deep layers on current climate changes.