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Rapid economical, sociological and political changes, that European societies are faced with during past few decades, significantly affect the changes in education in a way that they radically alter it. Mentioned changes emphasize the request for the review of the existing and the establishment of a new concept of in-service teacher training. Thus, teachers' professional development presently becomes the key question in the reform processes in those countries that endeavor to advance and refine their own educational systems and to adjust them to the needs of a modern society. In this paper we have analyzed the contemporary trends in the in-service teacher training in the Republic of Serbia. The aim of the paper is to indicate the importance of teachers' role in a modern society as well as the need of their adequate preparation and capacity for achieving professional roles through well designed and arranged system of in-service training. However, the results of the analysis show that despite the existence of decent legal frame, the current system of in-service training does not completely satisfy teacher's professional needs yet.