Has the European Union (EU) succeeded in socializing citizens to support the democratic values it claims to promote? On the face of it, the prevailing skepticism precludes any expectation of a successful socialization of EU citizens to the EU values. Yet, according to the socialization hypothesis, citizens' support for these values is expected to increase as countries accumulate more years of the EU membership. Using survey data to isolate distinct dimensions of democratic values, we examine differences among countries in this regard, as well as changes within countries over time. Results confirm the socialization hypothesis, showing that support for democratic values is generally higher in countries with more years of the EU membership, and that this support trends upwards over time.