Increasing commercialization and privatization of outer space and multifaceted uses and exploration of the space potential and benefits raise new challenges to the existing framework of international space law and its established procedural legal mechanisms. What are the legal perspectives of an adjustment, supersession or possible resistance of the five United Nations treaties on outer space? UNISPACE conferences have aimed to enhance international cooperation in the peaceful uses of outer space, including the promotion of common principles. UNISPACE+50 focuses, inter alia, on the issue of the “Legal regime of outer space and global space governance” and the effectiveness of the legal regime in the 21st century. Indeed, the international community is facing today new legal questions with respect to the exploitation of space recourses, multiplication of private space businesses, unilateral grants of national licenses to commercial sector, space traffic management, need for enhanced registration and precision of responsibility and liability regime, to name few. This presentation aims to introduce a general international legal framework of various procedural legal modes of further development of the five UN treaties, both in a de lege lata and de lege ferenda perspective. Light will be shed on the respective procedures of treaty law, prerequisites of the emergence of an international custom, role of non-legally binding standards, bottom-up impact of national legislations and assessment of an effective norm-making capacity of relevant stakeholders, all transposed in the space arena with regard to the current international space debate and practice of States. A selection of the most up-todate topics will serve as examples. This comprehensive legal outline aims to highlight various options that the UNISPACE dialogue and its agenda for the future can address.