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etcd versions are expressed as x.y.z, where x is the major version, y is the minor version, and z is the patch version, following Semantic Versioning terminology. New minor versions may add additional features to the API.

The etcd project maintains release branches for the current version and previous release. For example, when v3.5 is the current version, v3.4 is supported. When v3.6 is released, v3.4 goes out of support.

Applicable fixes, including security fixes, may be backported to those two release branches, depending on severity and feasibility. Patch releases are cut from those branches when required.

The project Maintainers own this decision.

You can check the running etcd cluster version with etcdctl:

The v3 API responses should not change after the 3.0.0 release but new features will be added over time.

Last modified October 18, 2023: Complete migration to owners file. (bc148e9)