The head of Poland’s Social Insurance Institution (ZUS), Zbigniew Derdziuk, has resigned from his position, effective Wednesday. The resignation is attributed to his deteriorating health condition. Deputy Prime Minister Władysław Kosiniak-Kamysz announced the departure and expressed gratitude for Derdziuk’s service to ZUS. Kosiniak-Kamysz revealed that Derdziuk has been hospitalized for the past six months. No details regarding the nature of his illness were disclosed. The change in leadership at ZUS comes as the institution navigates ongoing social security challenges. A successor to Derdziuk has not yet been named.