This research investigates the implementation of the Kurikulum Merdeka in English language learning at SMK Negeri 2 Banda Aceh, with an emphasis on English teachers perspective of it is effectiveness in improving students’ language proficiency, and also the problems faced during implementation. The research included six English teachers and used qualitative methods of research, including semi structured interview. The researcher select the sample for this research using the purposive sampling approach. The findings found that four themes impact students’ language proficiency to improve: student centered learning encourages students’ active participation, teachers more freedom in deciding materials that suit the interest of their students, the Kurikulum Merdeka liberates teachers’ expression of creativity in the classroom, and learning resources that can be obtained from anywhere. Additionally, teachers faced four major problems, including: teachers lack sufficient time to create teaching materials, teachers lack information related to the Kurikulum Merdeka from the school, teachers must be able to master Information Technology (IT) as a supporting tool, and parents who have not received information related to the Kurikulum Merdeka. This study emphasizes need of providing teachers with bigger support and profesional development in order to enhance the Kurikulum Merdeka’s effectiveness in increasing English language proficiency among vocational students.