Versioning

Versions follow x.y.z. In 3.7.1, 3 is x, 7 is y and 1 is z.

Part	Meaning
x	Major release. Large-scale refactoring of the core, or many breaking API changes. Usually not compatible with the previous x release — check that release's upgrade guide.
y	Feature release. Public APIs have breaking changes, including modifications and removals, which may break compatibility with earlier versions.
z	Fully compatible patch release. Bug fixes and security fixes, possibly with new functionality that does not affect existing code.

One exception: when a bug made a feature completely unusable, fixing it may involve a breaking change. Because the feature was broken anyway, such changes still ship as a z release rather than bumping y.

Upgrading

Click the version number in the bottom-left corner of the admin panel to check for and apply updates. Full instructions, including manual upgrades, are in upgrading and migrating.