Shaping solidarity, guaranteeing basic subsistence, maintaining income and employment activation can be seen as basic values underlying social security law in many European welfare states. This article argues that the meaning of these values or concepts is determined by legitimating discourses within which they are interpreted. While so far Rawls's theory of justice and related egalitarian liberal philosophies have had a great impact on these discourses, the ecological crisis has given rise to new discourses which are inspired by neo-republican theory and green republicanism. Instead of legitimising a capitalist economy based on economic growth, these discourses promote a post-productive society that seeks to realise human flourishing and meaningful lives. The aim of this article is to contribute to the emerging debate on social security reform by explaining how neo-republican theory and green republicanism can fill social security law's basic values or concepts with meaning that is more in line with current ecological concerns. In contrast to previous contributions that have sought to rethink labour and social security law (‘social law’) in a way that is more compatible with our ecological and climate crisis, this article builds on Poststructuralist Discourse Theory to develop its argument.