In the context of education 4.0, foreign language teachers face many challenges. They have to actively adjust their role in language transmission, take on the responsibilities of new-age foreign language teachers. The article examines the effect of several factors on the improvement of professional competence of foreign language teachers. Research results contribute to the fulfillment of Thai Nguyen University of Education's annual training for high school teachers. Research methods include collecting data by surveying, interviewing high school teachers, synthesizing, and processing data using SPSS software. Following that, a number of recommendations are proposed to contribute to the achievement of the educational reform goal of the country.