Marxan is the most widely used conservation planning tool worldwide. With more than 5600 users in over 180 countries, Marxan helps planners make informed decisions on where to make conservation investments, such as siting marine protected areas. In recent months, the Marxan development team has introduced several updates to the tool. We caught up with Matt Watts and Hugh Possingham of the University of Queensland to learn more. Watts is the lead technical developer for Marxan, while Possingham co-developed Marxan and serves as custodian of Marxan development and research.