Abstract: In the article, I aim to argue in support of the socio-scientific potential of Ulrich Beck’s concept of ‘cosmopolitization’ by subjecting it to a differentiated critique. Initially, the concept had a primarily Utopian potential, which is why critics have contended it had become obsolete in the context of the recent migrant crisis and its political consequences. On the contrary, I would argue that, beyond its Utopian potential, the concept has a social-scientific one as well. If detailed and elaborated, ‘cosmopolitization’ can become a useful sociological tool for analysis and diagnostics of current developments. Therefore, in contrast to Beck, who uses the term in an undifferentiated manner, I focus it at a specific level of social life – the level of normative regulations regarding foreigners; I explicate the sociological problem at this level by using Simmel’s metaphors of ‘window’, ‘bridge‘ and ‘door’. In conclusion, I suggest that revising the normative project of ‘cosmopolitization’ could advance the disclosure of the concept’s heuristic potential in a sociological perspective.