Following data center releases of Cumulocity will be aligned with the general quarterly Software AG release train and will be published with Software AG's versioning scheme. Hence, the next data center release after Cumulocity 9.20 will be Cumulocity 10.4.0.0.
The four digit versioning scheme is mainly used in documentation and communication material. Technical artefacts will continue to use the standard three digit semantic versioning and will continue to follow the compatibility model described in https://support.cumulocity.com/hc/en-us/articles/360001791687-APIs-SDKs-and-compatibility. To match the schemes, the first two digits of the four number scheme are simply combined. For example, the technical version number of 10.4.0.0 is 1004.0.0.