Update of Muonium 1S–2S transition frequency Irene Cortinovis, Ben Ohayon, Lucas de Sousa Borges, Gianluca Janka, Artem Golovizin, Nikita Zhadnov and Paolo Crivelli Eur. Phys. J. D, 77 4 (2023) 66 Published online: 19 April 2023 DOI: 10.1140/epjd/s10053-023-00639-z