The Sustainable Development Goals (SDGs) were adopted in 2015 to guide global progress towards a better world by 2030. However, current progress is insufficient, with only 20% of targets on track. To address this, the authors argue that the SDGs should be extended to 2050, with interim targets for 2030 and 2040, and final targets for 2050. This would require a holistic approach, integrating science, finance, and governance. Key priorities include extending the SDG framework, ensuring a healthy planet, enhancing planning and cooperation, addressing investment and finance, adopting mission-based approaches, and fostering change and accountability. The authors emphasize the need for inclusive consultations, clear and measurable targets, and the integration of technologies like AI. They also call for reforms in global financial architecture, stronger enforcement mechanisms, and a new economics of the common good. To achieve these goals, governments must extend their SDG policy pathways to mid-century, set mid-term milestones, and build long-term knowledge. Regional cooperation is crucial, especially in managing transnational issues. Public investment must be scaled up, and financial systems should support sustainable development. Mission-based approaches can help transform societal challenges into practical policy pathways. The authors recommend that UN member states adopt an updated SDG framework by 2026 and prepare revised national reviews by 2027. They also suggest establishing a global governance mechanism for planetary stability, adopting the SDG Stimulus programme, and reforming the global financial architecture. These actions aim to ensure sustainable development for all by mid-century, leaving no one behind.The Sustainable Development Goals (SDGs) were adopted in 2015 to guide global progress towards a better world by 2030. However, current progress is insufficient, with only 20% of targets on track. To address this, the authors argue that the SDGs should be extended to 2050, with interim targets for 2030 and 2040, and final targets for 2050. This would require a holistic approach, integrating science, finance, and governance. Key priorities include extending the SDG framework, ensuring a healthy planet, enhancing planning and cooperation, addressing investment and finance, adopting mission-based approaches, and fostering change and accountability. The authors emphasize the need for inclusive consultations, clear and measurable targets, and the integration of technologies like AI. They also call for reforms in global financial architecture, stronger enforcement mechanisms, and a new economics of the common good. To achieve these goals, governments must extend their SDG policy pathways to mid-century, set mid-term milestones, and build long-term knowledge. Regional cooperation is crucial, especially in managing transnational issues. Public investment must be scaled up, and financial systems should support sustainable development. Mission-based approaches can help transform societal challenges into practical policy pathways. The authors recommend that UN member states adopt an updated SDG framework by 2026 and prepare revised national reviews by 2027. They also suggest establishing a global governance mechanism for planetary stability, adopting the SDG Stimulus programme, and reforming the global financial architecture. These actions aim to ensure sustainable development for all by mid-century, leaving no one behind.