Arm's popular open source embedded operating system Mbed OS will end official maintenance in July 2026

According to news from this site on July 17, Arm issued an announcement this month, announcing that its open source Mbed platform and operating system will end its life cycle in July 2026. At that time, the Mbed website will be archived and projects will not be built through online tools. The device software, Mbed OS, is open source and will continue to be publicly available, but is no longer actively maintained by Arm. The Mbed TLS project is not affected by this announcement and will continue to be supported as part of the TrustedFirmware community project.

Arm officials said that since 2009, Mbed has been a very popular project, helping professional developers, educational users and the maker community create, secure, deploy and update thousands of applications on Arm-based hardware.
At the same time, Arm-powered projects like the micro:bit, Arduino, and Raspberry Pi gained momentum in educational settings and the maker community, making many of the features offered by Mbed more widespread and accessible. Officials believe these needs can now be best served by the broader ecosystem without direct support from Arm.

1. Mbed is no longer used as an embedded development teaching platform

Arm recommends that educational institutions stop using Mbed as an embedded development teaching platform. The Arm Education team is creating alternative solutions for the new semester starting in fall 2025.

2. Mbed OS code base archive

Arm has stopped actively maintaining the Mbed OS code base and will archive it in GitHub after July 2026. Terms of use for Mbed OS remain unchanged and developers can still use it for existing projects.

3. Mbed Project Builds

Mbed projects can no longer be built in Keil Studio Cloud or Mbed Studio, but can be built via Mbed CLI and GCC.

4. Mbed CE branch is actively developed

Mbed OS community branch Mbed CE is still under active development, and open source developers will be responsible for maintaining the new branch.

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