The “Guidelines on the Versioning of SDMX Artefacts” provide recommendations on how to version SDMX artefacts inspired by “semantic versioning”, i.e. a formal convention for specifying compatibility between the different versions of a “versionable” artefact (a SDMX artefact that has an associated version number). Versioning is central to SDMX because it guarantees the stability of references to SDMX artefacts. This is of the utmost importance given the sometimes strong dependencies between artefacts, especially in Data Structure Definitions (DSDs). The document contains three main recommendations: a) numbering system and syntax; b) types of artefact changes and their versioning impact; c) how versioning works for inter-dependent artefacts. The document’s appendix contains examples of several types of changes and their versioning impact.