Ensuring digital sovereignty has become a critical concern for governments in Europe. On February 7, 2024, France and Germany took a significant step forward by announcing their collaboration towards creating sovereign digital workspaces for their public administrations. This session brings together representatives from DINUM (French Interministerial Digital Directorate) and ZenDiS (the German Centre for Digital Sovereignty), who are co-developing La Suite Numérique (France) and openDesk (Germany). Both initiatives prioritise open-source solutions in developing their respective digital suites. DINUM and ZenDiS thus demonstrate that digital sovereignty relies heavily on close international collaboration. In their joint presentation, they discuss strategies of cooperation between their complementary initiatives, shedding light on potential opportunities for future collaboration within the broader open source community.