Platform work continues to grow. This is also true in European countries, where it poses challenges for access to social security systems and their financing. The book “Social 4.0”, published in 2021, examines these challenges and presents innovative solutions in different countries and in European cooperation. Four years on, in which the practical difficulties have become even more apparent, the “Update” asks whether the solutions have worked and what further developments have taken place. Short reports from Belgium, Italy, the United Kingdom, France, Sweden and the Netherlands answer these questions. They are complemented by insights into EU social and tax law. In a detailed concluding chapter, the findings of both books are systematically summarised, evaluated comparatively and guidelines for future legislative responses are presented. With contributions by Prof. Dr. Eduardo Ales | Prof. Dr. Ulrich Becker, LL.M. (EUI) | Charlotte Bruynseraede, Ph.D. | Olga Chesalina, Ph.D., LL.M. | Emilia D’Avino, Ph.D. | Prof. Dr. Yves Jorens | Prof. Dr. Francis Kessler | Ass. Prof. Dr. Philip Larkin | Ass. Prof. Dr. Saskia Montebovi | Prof. Katerina Pantazatou, Ph.D. | Prof. Dr. Paul Schoukens | Prof. Dr. Grega Strban | Prof. Dr. Gijsbert Vonk | Prof. Dr. Annamaria Westregård