Critical infrastructure are facilities that are crucial for the smooth functioning of the state. Disruption of critical infrastructure can affect people's lives. From this point of view, it is important that employees with appropriate competencies operate in such infrastructures. These competencies can be collected in the competency model. This is a list of competencies that describe the characteristics of the employee in terms of skills, knowledge, behaviour, and experience. The purpose of this paper is to highlight the main features of competency models in critical infrastructures. This represents an opportunity for further research and implementation of competency models in critical infrastructure systems. However, since it all starts at the top, we discuss the competencies of managers. The integration of competency models into critical infrastructures is an important area, as such models make it easier and faster to acquire key employees.