The upgrade to the latest available Domibus version is not mandatory but recommended. Note that the custom plugins need to be updated in order to be compatible with a new Domibus version.
Domibus releases are supported by default for a period of at least one year starting from the release date of their minor version (for more information, see Domibus releases and Support arrangement). Domibus releases labelled as Long-Term Support Arrangement (LTS) are supported for a period of at least two years from the release date of their minor version. The exact expiration dates of the support period are presented in the release notes and in the Domibus roadmap. Releases under LTS will be clearly identified.