The latest version of Headscale is as of my knowledge cutoff in July 224, and as of July 224, the most recent release is Headscale 1.. However, please note that this information is based on publicly available information as of July 224, and headscale might have updated the version number or features since then. It's always a good idea to check the official Headscale website or release notes for the most accurate and up-to-date information.