The school library is the place of meeting for all the stakeholders of the learning process in schools. With digital technologies and access to information advancing at the dizzying rate, the school library has a major and significant role to play. The main feature of the post-digital era is the availability and the fast exchange of information. In this context, a flexibility and adaptation of the education system is needed, which means that teachers' methods and teaching styles must be updated as well. School libraries should be a space where students study independently, look for information, collaborate with other students and teachers and learn how to participate in society. The role of the school librarian is to encourage learners' independence through project and inquiry - based learning, and develop collaborative relationships with other students and teachers and expert associates. The main paradigm of the Croatian national curriculum is the instruction for the achievement of the competences of the 21st century, such as creativity, communication, collaboration, and most importantly development of media literacy. In the course of this process, it is necessary to introduce new teaching methods. The main emphasis of this process is the development of self-regulated learning that should be fostered in students by introducing inquiry based - learning. Inquiry - based teaching and learning is based on enabling students to find information independently. In addition to inquiry based instruction, the emphasis should also be placed on problem based and project based learning. The school librarians have a very important role in the implementation of the school project. It is important to select an interesting topic, define project aims and activities. Project implementation involves defining the objective, outcomes, participants, timetable and budgets. After initial planning, the implementation of the project will be followed by the evaluation and dissemination phases. In the research carried out on the respondent sample of 45 school librarians in Croatia, two hypotheses were tested: the involvement of school librarians in inquiry and project based teaching and learning and the involvement of the local community in school projects. The aim of this thesis is to establish the new and adapted roles of school libraries in the post-digital era. The research confirms the hypothesis according to which school librarians are regularly organizing or participating in inquiry and project- based learning and teaching as part of the school library's syllabi. The research doesn't confirm the hypotheses according to which school libraries and librarians involve the local community in school projects which leaves a lot of room for improvements.