This study examined the impact of COVID-19 on the beliefs of high school mathematics teachers in Pakistan regarding the use of digital resources. Participants were six mathematics teachers from both private and government schools with varying years of teaching experience. The responses indicate that despite facing issues, teachers' beliefs have significantly changed due to COVID-19 online teaching. Teachers' beliefs are subject to the opportunities and constraints that exist in the social context of teaching mathematics, which includes the influence of students, parents, schools, peers, and senior teachers. The regular practice and use of digital resources may further deepen teachers' beliefs and their use in mathematics teaching.