The overarching objective of Euro-Argo RISE (Euro-Argo Research Infrastructure Sustainability and Enhancement) is to enhance and extend the capabilities of the Argo network to provide essential ocean observations to answer new societal and scientific challenges. Euro-Argo RISE project is needed now to allow Europe to timely develop the European contribution to this new phase of Argo and engage with new teams. Euro-Argo RISE aims to secure and improve the current network as well as to set up and organise on the long term the new components of the network, extending Argo observations towards biogeochemistry, greater depth, partially ice-covered and shallower water regions within a long-term sustainability plan supported by Member States and funding agencies.