Conference on Professional Development in the Digitized Society is a peer-reviewed international conference focusing on research advances and applications of combined use of computer hardware, software, and educational theory and practice to facilitate professional development. PDDig tracks and topics of interest are: Track 1: Management of professional development in the digital space of formal and non-formal education Methodological principles of management of continuous professional development in the conditions of open postgraduate education and distance learning Experience of professional development in formal and informal open postgraduate education Quality management of professional development in the digital space of formal and non-formal education Educational technology park in innovative management of education quality Track 2: Training and professional development in the digital twin of the educational institution Modern technologies for distance learning Digital competence of the teacher: means of formation and development Web tools for organizing and supporting distance learning Learning management software as the basis for the formation of the digital twin of an educational institution Digital twin of educational institution as a solution to innovative educational problems Digital presentation of the functionality of the educational institution Track 3: Psychological safety of in the digital educational environment Information and psychological security of the individual: challenges of today Psychological aspect of interaction in the digital educational environment Factors of psychological safety in the digital educational environment How to create and maintain a psychologically safe digital educational environment Track 4: Training of managers of socio-political profile in the digitalized society Trends, risks and determinants of socio-economic development of the organization in the era of digitalization Personal development and psychological assistance of managers Training in project management system and public administration Training of managers of special and inclusive education Management of educational institutions Track 5: Teacher's soft skills development Soft skills as an educational trend and a component of professional development Soft skills development models Competence-based professional development of teacher Monitoring the quality of teacher training Authors are invited to submit full (and original research) papers (at least 10 pages) including surveys, tutorials, perspective/colloquia articles in conference topics of interest through the HotCRP (https://notso.easyscience.education/pddig/2021/) by September 20, 2021. PDDig 2021 uses one-column CEURART style for the proceedings (https://cte.ccjournals.eu/cte2021/CEURART.zip). Therefore, for preparing your submission please STRICTLY FOLLOW the Guidelines to format your document for CEUR-WS (http://ceur-ws.org/Vol-XXX/sample-1col.pdf) and use sample-1col.tex file from CEURART.zip as template. Your submission should be prepared using LaTeX and one-column CEURART style. Submitted papers will be peer-reviewed by three reviewers on the basis of technical quality, relevance, originality, significance, and clarity. If necessary, a fourth, additional reviewer will be involved. The Program Committee will use these reviews to determine which papers will be accepted for presentation at the conference. The result of the reviewing will be announced to the submitting authors by email, along with reviewer comments, if any.