Building on the successful Synchronisation Force workshop 2022, the 2023 edition of the Synchronisation Force workshop aimed to discuss common challenges and priorities related to turning the FAIR principles into practice. The workshop took place as a series of seven virtual sessions between 2 November 2023 and 8 February 2024, with the five core sessions between 27 November and 7 December 2023. Topic Session 4: Tuesday, December 5, 14.00-15.30 CET: Trustworthy and FAIR-enabling repositories In this session we discussed the current mechanisms and cooperation opportunities for Trustworthy and FAIR-enabling repositories. We looked into the wider range of transparency and trust, and the incremental and sustainable support needed. This session aimed to pick up on progress against the three recommendations identified from the 2022 Synchronisation Force session which were to: Measure the percentage of repositories in EOSC that will have a certification such as CoreTrustSeal or expose trustworthiness using other mechanisms Provide incremental, continuous and sustainable guidance and assistance to repositories, and certification processes Contribute to cooperation across the current initiatives to build and sustain a network of trustworthy digital repositories