Autonomous Vehicle Cybersecurity Development Lifecycle (AVCDL) document, version 56. This document outlines a comprehensive framework of processes and requirements designed to ensure the cybersecurity of autonomous vehicle development. It details various phases of the lifecycle, from foundational elements like training and threat prioritization, through design, implementation, verification, release, operation, and decommissioning, specifying security considerations for each. Furthermore, it addresses the roles and responsibilities of different organizational groups involved and maps the AVCDL to relevant industry standards and regulations, including ISO/SAE 21434 and WP.29, to facilitate compliance.