In recent decades, companies across the world have implemented Enterprise Resource Planning (ERP) systems. The proper ERPs implementation has been a much explored issue. In contrast, ERP systems maintenance has been treated with less depth. ERP maintenance is necessary to achieve the system’s maximum performance. Nevertheless, these projects are often managed intuitively and without taking into account the existing risks. To address this need, we have studied ERP maintenance risks. In this way, we have identified and classified the risks affecting the performance of ERP maintenance projects. Moreover, we have applied a multicriteria decision making methodology to assess them. The results will help practitioners to manage ERP maintenance project risks in a better way