ClassNK, a leading classification society, has introduced the 'Guidelines for Liquefied Hydrogen Carriers (Edition 3.0)' to ensure the safety of liquefied hydrogen carriers and support the advancement of technology in this sector. The guidelines come at a crucial time when there is a growing emphasis on hydrogen as a clean energy source in the transition to a decarbonized society. These guidelines are essential for the construction of a reliable supply chain for hydrogen, facilitating large-scale and efficient transportation. The International Maritime Organization (IMO) has been actively working on establishing safety requirements for liquefied hydrogen carriers to maintain cargo at extremely low temperatures, with interim recommendations adopted in 2016. Recent developments in liquefied hydrogen carriers have necessitated the revision of these recommendations, leading to the ongoing discussions at IMO since 2021, where ClassNK has been actively participating. The latest edition (3.0) of the guidelines by ClassNK reflects the updated interim recommendations and incorporates new safety measures for cargo containment systems. Additionally, the guidelines now provide guidance on selecting suitable metallic materials for hydrogen equipment, anticipating future advancements in the industry. ClassNK's contribution to these discussions showcases its dedication to enhancing safety standards and regulatory compliance in the liquefied hydrogen carrier sector.