On 1 January 2021, nine years after the last major overhaul of the ICC Rules of Arbitration and less than four years after a very limited revision of these Rules in 2017,2 a new version of the ICC Rules of Arbitration will come into force. While the 2021 ICC Rules contain a rather limited number of changes compared to the 2012 and 2017 predecessor versions, some of those changes are particularly significant. The 2021 ICC Rules will apply to all new ICC cases commenced as of 1 January 2021, regardless of the date of the arbitration agreement under which the arbitration is brought.