Delaying Lyrical RMW and Feature Freezes

The ROS (Robot Operating System) Project Management Committee has officially postponed two critical deadlines for the upcoming ROS 2 "Lyrical" release. Announced by contributor sloretz on April 8, 2026, the committee decided to delay the RMW (ROS Middleware) freeze and the feature freeze by one week each. This adjustment pushes the RMW freeze to April 14, 2026, and the feature freeze to April 21, 2026. The primary reason for the delay is to grant developers additional time to upgrade and stabilize all Tier 1 RMW implementations, which are core communication layers like Fast DDS and Cyclone DDS that enable ROS nodes to talk to each other. The final branch from the rolling repository is now scheduled for April 22.

Despite these shifts in intermediate milestones, the overall release schedule for ROS 2 Lyrical remains on track. The decision, documented in Pull Request #6350 to the ros2_documentation repository, reflects the project's commitment to ensuring a stable and robust release. This pattern of adjusting freezes is not uncommon in ROS development, as seen with past releases like Jazzy Jalisco and Iron Irwini, where similar tweaks were made to accommodate integration and testing needs. The extra week provides crucial breathing room for the community to finalize and validate the middleware that forms the backbone of ROS 2's distributed communication system.