Work on the second DFI Transparency Index is underway, in preparation for launch in July 2025. The Index ranks the transparency of the world’s leading development finance institutions (DFIs) and encourages improvement. We recently completed a methodology review, involving stakeholder consultation, to improve the rigour of the DFI Transparency Index, while maintaining comparability between the 2023 and 2025 editions. Here we set out the changes that have been made to the methodology, including the addition of new climate finance indicators.