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Docker Image Versions

Versioning Rule

Zephyr Docker image uses the major.minor.revision version format:

• major is always 0.
• minor is incremented for every Zephyr release.
• revision is incremented for every new Docker image release.

Each major.minor version, also called "compatibility level", is associated with a specific Zephyr release and hence a Zephyr release branch (vX.Y-branch).

For example, the Zephyr Docker image version 0.28.x is associated with Zephyr 4.2 release and the Zephyr v4.2-branch tracks the CI image v0.28.x.

When a new Zephyr version is released, the Zephyr Docker image release branch for the last major.minor release is created, and any updates for the corresponding Zephyr version are released from that release branch.

For example, at the time of Zephyr 4.2 release, a new Zephyr Docker image release branch, v0.28-branch, is created and any future Docker image updates for Zephyr 4.2 must be merged to and released from the v0.28-branch.

Compatibility Levels

Image Version	Zephyr Version
0.26	3.7
0.28	4.2-4.3
0.29	main/4.4