The paper presents results of a longitudinal study investigating levels of language anxiety experienced by secondary school students learning English in a Polish secondary school. The main findings of the research focus on levels of language anxiety experienced over 3 years of FL study. This variable is also correlated with semester grades, self-perceived levels of foreign language skills and the length of language study. The results corroborate the main hypothesis of the research, according to which the language anxiety levels decrease with the development of language proficiency over time. That is not the case of dyslexic students whose language anxiety intensity remains stable. Language anxiety levels are also gender-dependent with girls experiencing their significantly higher levels than boys.