Jutta Bolt presented a joint paper with Herman de Jong, Robert Inklaar and Jan Luiten van Zanden in the session ‘The Maddison project: measuring economic performance across time and space’ at the XVIIth World Economic History Congress, Kyoto. The paper reports work-in-progress on updating the Maddison database on long-run income levels to reflect the latest cross-country relative income levels out of the International Comparison Program (ICP). This update will lead to important shifts in historical comparative income estimates. The revised database is expected to be released in the first half of 2016.