This article lays out an agenda for researching the social policy challenges facing the EU under the combined impact of a triple transition: green, digital and demographic. It takes as its starting point the double bind confronting the welfare state, pressured by increasing costs and serious socio-ecological concerns on the one hand, and the need, more daunting than ever, for protection against a vast array of imminent socio-economic, demographic and environmental risks, on the other. Against this background, it explores the complex web of synergies and trade-offs between the three transitions, examines the disjointed manner in which EU social policy has so far developed, and demonstrates the controversial stance of the EU’s overarching strategic framework – the European Green Deal – on the issue of a socially just transition. It also maps key research foci and gaps deserving further study, including the role of key players in the transition.