The International Chamber of Commerce (ICC) has announced that the revised ICC Arbitration Rules will enter into force on 1 June 2026, introducing changes to arbitrator disclosure obligations intended to strengthen transparency, efficiency and confidence in the arbitral process. The revisions, introduced by the ICC International Court of Arbitration (ICC Court), retain the existing requirement for arbitrators to disclose any circumstances that could call into question their independence or raise reasonable doubts about their impartiality, while formally incorporating two principles previously contained in ICC guidance notes: that any uncertainty about whether disclosure is necessary should be resolved in favour of disclosure, and that disclosure alone does not establish a lack of independence or impartiality. The Rules also introduce a new obligation requiring parties, at the outset of proceedings, to provide the Secretariat with a list of persons and entities they believe arbitrators should consider when assessing potential disclosures, together with reasons for their relevance, in order to identify possible issues earlier and reduce the risk of late-stage disputes. The ICC Court stated that these changes align the Rules more closely with established practice while preserving the arbitrator’s ultimate responsibility for disclosure decisions.