Automotive systems are now shifting to become more software-based machines. The AUTOSAR (AUTomotive Open System ARchitecture) standard defines a software architecture, which remains quite static: this is one of its main drawbacks. Before a vehicle is put in operation, the whole software system is tested, validated and then uploaded in ECUs in a monolithic fashion. Improving adaptability of software system would allow car manufacturers to easily modify the initial configuration or provide additional features to the customers. For this reason after a careful analysis of the main concepts of the standard, we defined an approach for allowing dynamic updates. Currently such modifications are not supported by the standard, but could lead to significant gain in time and resources. Based on this approach we analysed the undesired events that could arise in consequence of the mechanisms added for the updates. Then safety features are suggested in order to help preventing these hazards, in terms of prevention and tolerance.