The IATI standard is a living entity that requires improvement over time. The elements, attributes, rules and core codelist values can only be amended, added or removed during a formal upgrade.
See How we manage the standard to find out more about our upgrade processes.
See Upgrade changelogs to find out the changes made at each upgrade.
The only part of the Standard which can be updated outside of a formal upgrade are non-core codelists here. These codelists are not version specific and additions or modifications have minor impact on already published data.
Often these codelists are replicas of codelists managed externally. IATI will keep the codelists up to date and log all changes made to a codelist e.g. when the ISO Country Codelist updated the country name Swaziland to eSwatini.
A changelog of the non-core codelists is available here.