I don't think so necessarily, however as with any social science at masters level you will probably need to be able to engage with a certain range of social research methods, including quantitative methods, and be able to interpret statistical data etc, that might be present in papers you are reading for the lecture courses or your masters dissertation.
So I'm not sure there is so much an explicit requirement that you need to have any particular mathematical background, but there is probably an implicit requirement you are able to think quantitatively and put into practice at least some basic quantitative techniques of data analysis and interpretation where necessary.