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Lyrical Luth (codename 'lyrical'; May, 2026)

Lyrical Luth is the twelfth release of ROS 2.

Release Timeline

As soon as possible - Migrate ROS Rolling to ROS Lyrical's target platforms

• RHEL 10 + Ubuntu 26.04: Migrate as soon as core packages successfully build on both platforms.

• Windows 11: Migrate as soon as we have a green build

Mon. April 13, 2026 - Alpha + RMW freeze (Delayed; was originally April 6th)

• Preliminary testing of ROS Base packages

• API and feature freeze for RMW provider packages.

Mon. April 20, 2026 - Freeze (Delayed; was originally April 13th)

• API and feature freeze for ROS Base packages in Rolling Ridley.

• Only bug fix releases should be made after this point.

• New packages can be released.

Mon. April 21, 2026 - Branch (Delayed; was originally April 20th)

• Branch from Rolling Ridley

• rosdistro is reopened for Rolling PRs for ROS Base packages.

• Lyrical development shifts from ros-rolling-* packages to ros-lyrical-* packages.

Mon. April 27, 2026 - Beta

• Updated releases of ROS Desktop packages available.

• Call for general testing.

Thu, April 30, 2026 - Kick off Tutorial Party

• Open up tutorials for community testing.

Mon. May 11, 2026 - Release Candidate

• Build release candidate packages up to ROS Desktop

Mon. May 18, 2026 - Distro Freeze

• Freeze all Lyrical branches on all ROS desktop packages

• No pull requests for any Lyrical branch or targeting lyrical/distribution.yaml in rosdistro repo will be merged.

Friday May 22nd, 2026 - General Availability

• Release announcement.

• ROS desktop packages source freeze is lifted and rosdistro is reopened for Lyrical pull requests.

For progress on the development of Lyrical Luth, see this project board. For the broad process followed by Lyrical Luth, see the process description page.

Supported Platforms

ROS Lyrical supports the following platforms according to the platform support tiers:

Architecture	Ubuntu Resolute (26.04)	Ubuntu Noble* (24.04)	Windows 11 (VS2022)	RHEL 10	macOS	Debian Trixie* (13)	OpenEmbedded / Yocto Project
amd64	Tier 1 [d][a]	Tier 3	Tier 1 [a]	Tier 2 [d][a]	Tier 3	Tier 3	Tier 3
arm64	Tier 1 [d][a]	Tier 3				Tier 3	Tier 3
arm32	Tier 3	Tier 3				Tier 3	Tier 3

• * Early EOL per the platform EOL policy

  • Ubuntu Noble is supported until 2029-06-01

  • Debian Trixie is supported until 2028-08-09

• [d] You may install ROS Lyrical on this platform using Distribution-specific packaegs (Debian, RPM, etc.).

• [a] You may install ROS Lyrical by downloading an archive containing pre-built packages for all packages in the ROS Lyrical ros2.repos file

To use ROS Lyrical on any Tier 3 platform, you must build ROS Lyrical from source.

Minimum Language Requirements

• C++20

• C17

• Python 3.12 - 3.14

Dependency Requirements

TODO - this section will show a table of important system package versions across supported platforms.

Middleware Implementation support

The default middleware in ROS Lyrical is rmw_fastrtps_cpp.

Middleware Library	Middleware Provider	Support Level	Platforms	Architectures
rmw_fastrtps_cpp	eProsima Fast-DDS	Tier 1	All Platforms	All Architectures
rmw_connextdds	RTI Connext	Tier 1	Ubuntu, Windows, and macOS	All Architectures except arm64
rmw_cyclonedds_cpp	Eclipse Cyclone DDS	Tier 1	All Platforms	All Architectures
rmw_zenoh_cpp	Eclipse Zenoh	Tier 1	All Platforms	All Architectures
rmw_fastrtps_dynamic_cpp	eProsima Fast-DDS	Tier 2	All Platforms	All Architectures
rmw_gurumdds_cpp	GurumNetworks GurumDDS	Tier 3	Ubuntu and Windows	All Architectures except arm32

Middleware implementation support is dependent upon the platform support tier. For example, a Tier 1 middleware implementation on a Tier 2 platform will only receive Tier 2 support.

Installation

TODO

New features in this ROS 2 release

ament_cmake

Allow multiple ament_python_install_package() calls per package

This enables shipping a single package with both python code and generated interfaces (from rosidl_generate_interfaces()). Source directories from each call are merged at install time, with the last call winning on file conflicts.

See https://github.com/ament/ament_cmake/pull/587 for more details.

class_loader

Add support for passing arguments to constructors. As a result, users can now create plugins that are not default constructible, removing the need for initialize method.

See https://github.com/ros/class_loader/pull/223 for more details.

plugin_lib

Add support for passing arguments to constructors.

See https://github.com/ros/pluginlib/pull/291 for more details.

image_transport

image_transport now supports lifecycle nodes.

See https://github.com/ros-perception/image_common/pull/352 for more details.

point_cloud_transport

point_cloud_transport now supports lifecycle nodes.

See https://github.com/ros-perception/point_cloud_transport/pull/109 for more details.

rcl_logging_implementation

A new rcl_logging_implementation package has been introduced to allow users to select the logging backend implementation at runtime without rebuilding rcl. Users can set the RCL_LOGGING_IMPLEMENTATION environment variable to switch between available logging backends (e.g., rcl_logging_spdlog, rcl_logging_noop, or custom implementations). If not specified, rcl_logging_spdlog is used by default.

See https://github.com/ros2/rcl/issues/1178, https://github.com/ros2/rcl/pull/1276, and https://github.com/ros2/rcl_logging/pull/135 for more details.

rclcpp

• Added new Callback Group Events Executor. Like its predecessor the experimental EventsExecutor, the EventsCBGExecutor uses an events queue to process ready entities. Builds on the experimental EventsExecutor by adding support for multiple sources of ROS time and multiple threads. Compared to the Single and Multithreaded Executors, the EventsCBGExecutor exhibits around 10 to 15% less CPU usage. Note: The experimental EventsExecutor is now deprecated. For similar performance, use the EventsCBGExecutor with one thread.

• Unified component container interface - component_container is now the single entrypoint for launching both regular and isolated component containers with all types of executors.

• Added disable_callbacks() and enable_callbacks() APIs to SubscriptionBase. By design the subscription itself is a shared pointer and its callbacks are propagated to the executor, making it difficult to manage subscription lifecycle from the application side. When a subscription is deleted at the application layer, it may still be referenced by the node and executor, causing callbacks to be invoked unexpectedly. This can lead to undefined behavior when the callback accesses resources that have been cleaned up. The new APIs allow users to disable subscription callbacks at runtime without destroying the subscription, preventing unexpected callback invocations.

  See ros2/rclcpp#2984 and ros2/rclcpp#2985 for more details.

rclpy

Native asyncio support with AsyncNode (experimental)

Added AsyncNode, a new node type that runs on the asyncio event loop. Subscription, service, and timer callbacks can now await any asyncio operation. The new async client.call(request) and sim-time aware clock.sleep(...) are awaitable from any asyncio task. CPU usage is significantly reduced compared to the SingleThreadedExecutor.

See the Writing an async node with asyncio tutorial and https://github.com/ros2/rclpy/pull/1620 for more details.

rosbag2

Rosbag2 received several new recording, playback, observability, and API improvements.

• Added support for repeating transient-local messages when recording bags. Users can configure selected transient-local topics with --repeat-transient-local and an optional per-topic depth, or use --repeat-all-transient-local to automatically apply the behavior to topics whose publishers offer TRANSIENT_LOCAL durability QoS. This helps preserve latched/static state, such as maps or static transforms, across bag splits and snapshots.

  See ros2/rosbag2#2385, ros2/rosbag2#2386, ros2/rosbag2#2387, and ros2/rosbag2#2391 for more details.

• Added recorder service APIs for starting and stopping recording, starting and stopping topic discovery, and querying whether discovery is running. This makes it possible to control a recorder process remotely through ROS services instead of only through the command-line process lifecycle.

  See ros2/rosbag2#2248 for more details.

• Added scheduled service operations for coordinated recording and playback workflows. Record, play, resume, and split operations can now be scheduled by time, with support for node time, publish time, and receive time modes where applicable. Service responses were also extended with explicit return codes and error strings.

  See ros2/rosbag2#2330 and ros2/rosbag2#2357 for more details.

• Added circular logging by split count. When recording with bag splitting enabled, --max-bag-files limits the maximum number of bag files stored on disk by automatically deleting the oldest split files as new ones are created.

  See ros2/rosbag2#2218 for more details.

• Added a time-bounded snapshot cache option, --max-cache-duration. This allows snapshot-mode recording to bound the cached data by duration in addition to existing cache controls.

  See ros2/rosbag2#2289 for more details.

• Added message-loss observability during recording. Rosbag2 can now collect message-loss statistics from the transport layer and recorder internals, and publish incremental per-topic loss events on the predefined events/rosbag2_messages_lost topic. The publishing rate can be configured with --stats_max_publishing_rate.

  See ros2/rosbag2#2039, ros2/rosbag2#2144, and ros2/rosbag2#2150 for more details.

• Expanded the rosbag2_py player and recorder APIs. Python users can now programmatically control playback and recording with APIs such as pause, resume, stop, seek, play-next, spin control, and wait helpers, instead of relying only on blocking command-line-style helpers.

  See ros2/rosbag2#2047 and ros2/rosbag2#2062 for more details.

• Added APIs for querying player timing metadata. Users can now query the player's starting time and playback duration, and Python readers can access the send timestamp when reading serialized messages.

  See ros2/rosbag2#2061 and ros2/rosbag2#2095 for more details.

• Improved message definition resolution for recorded data. Rosbag2 can now find message definitions in nested subdirectories, better resolve inner message definitions for service and action introspection data, and support relative includes in local IDL message definitions.

  See ros2/rosbag2#2041, ros2/rosbag2#2052, ros2/rosbag2#2055, and ros2/rosbag2#2241 for more details.

• Updated split bag file naming to include the split index, bag name, and timestamp, making split files easier to identify and sort.

  See ros2/rosbag2#2265 for more details.

• Enabled the rosbag2_performance_benchmarking package to be built by default, making the benchmarking tools easier to use for recorder and player performance evaluation.

  See ros2/rosbag2#2093 for more details.

rosidl_python

Passing in Python set objects into array or sequence fields is now deprecated. Instead pass in something that implements collections.abc.Sequence most commonly a list, tuple, or a numpy.ndarray. To be removed in ROS M.