Teachers' continuous professional development in the digital technology field is crucial, and different professional development programs are composed to meet this need. This paper gives an overview of one such program, named "Digital Accelerator", created in Estonia, and assesses whether it is effective in promoting teachers' use of digital technology and their beliefs towards it. A total of 59 participating teachers filled in pre- and post-questionnaires, and for data analysis, non-parametric tests were used. The results revealed that the use of digital technology in teaching and learning activities increased, and participating in educational technology mentoring was the most influential program activity. Also, it was evident that perceived ease of use and general attitudes towards digital technology had increased significantly. However, based on the results, we could conclude that giving the participating teachers in training too much power to choose the content is not the most useful approach.