Our May 4, 2024 update to the Arsenical Books Database brings the total of confirmed arsenical green books identified around the world to 313! We are grateful for data submissions from Dr. Andreas Janke at Staatsbibliothek zu Berlin – Preußischer Kulturbesitz; conservator Anna Johnson at the University of Southampton Library (UK); MLIS student Ashlyn Higareda, and Head of Preservation Stephanie Lamson at the University of Washington Library (U.S.). We would also like to thank our colleague Jill LeMin Lee at the Philadelphia Athenaeum, who pointed out that the “Date Added” column was not sorting properly. We have changed the date format and believe this has resolved the problem. We appreciate constructive feedback from users that helps us improve the website functionality.