Due to its social role and importance, the teacher's vocation, despite the fact that in recent decades has been underestimated and marginalized in Serbia, it still has one of the most responsible functions in managing developmental changes. In a time of rapid change, education is a key link in that chain. Professional development of teachers is a prerequisite for every reform and improvement of the quality of the educational process. The current status requires from teaching staff to focus on modernization of the teaching process. For this reason, Wikimedia Serbia has developed a project of professional development which is registered by the Institute for Education Improvement, the state body for issuing accreditations. A seminar titled "Applying online wiki tools in teaching and learning" prepares teachers for the introduction of modern technology and information resources into the teaching process. In terms of that, Wikimedia Serbia is guided by the idea that teacher education is a very important part of improving the quality of the education system and that without reform of teacher education, there can be no effective education reform.

Key words: education, professional development, Wikipedia