This paper presents BPMN4V, an extension of BPMN 2.0 to support business process adaptation modelling using versions. It introduces the provided extensions to the BPMN meta-model to take into account the notion of version, considering both static and dynamic aspects of process versions. It also presents BPMN4V-Modeller, an implementation of these extensions. Therefore, using BPMN4V business process designers can model process adaptation, which is an important issue to address before the definitive acceptance and use of business process management systems in companies.