Our world is becoming increasingly more digital, but its security has not catched up yet. Therefore, cyber security is becoming ever more important and needs to be improved. This improvement can be made by increasing collaboration and knowledge exchange. A Community of Practice (CoP) is a concept often deemed an appropriate tool to manage knowledge within organizations and between knowledge partners. A better understanding on how to create and implement CoPs for cyber security-related topics could further improve cyber security. This research aims to achieve two objectives. The first objective is to gain insights in the establishment of Communities of Practice on cyber security in order to contribute the current scientific literature. The second is to use these insights to provide a possible solution to create a Community of Practice on cyber security for the FERM case in the Rotterdam port area.