Designing modern naval vessels to be fit to receive future extension modules is a way of futureproofing the vessel design, while at the same time reducing initial build cost. Energy storage technology is rapidly progressing, and navies should be capable of future proofing for the latest technology for operation gains. Naval vessels have a relatively long lifetime compared to many commercial vessels and decreasing the complexity of integration or upgrade of power system modules such as batteries and fuel cells, while also allowing for higher share of pulsed high-power loads such as high energy weapons and radars during its lifetime could be beneficial. DC power systems are marking their entry into the navy segment, where they offer advantages in flexibility and modularity of the power system, where all sources and loads are connected to one or multiple DC switchboards through converter modules. In this paper, ways of futureproofing a DC power system design are examined, with a focus on gaining the capability to receive future power system modules throughout the lifetime of a vessel. The paper will introduce the DC power system and present possible future extensions of the power system and explore how such extensions may be integrated into it. It will present different strategies such as design for a specific future component or be able to integrate a variety of different components. It will also explore the use cases for containerized mission modules. The need for more mature standards for DC power system is pointed out, which are important for successfully implementing the ideas presented.