API Platform follows the Semantic Versioning strategy. A new minor version is released every six months, and a new major version is released every two years, along with a last minor version on the previous major one with the same features and an upgrade path.
3 versions are maintained at the same time:
Older versions (1.x, 2.6…) are not maintained. If you still use them, you must upgrade as soon as possible.
There’s a crowdfunding for a 2.7 LTS version.
The old-stable branch is merged in the stable branch on a regular basis to propagate security fixes. The stable branch is merged in the development branch on a regular basis to propagate security and regular bugfixes.
New major versions of API Platform are released every 2 years. New minor versions of API Platform are released every 6 months.
The latest minor version of a major branch contains all the new features introduced in the first version of the next major, but also contains deprecated features which are removed in the next major branch.