This release updates the contentId parameter on the email attachment schema. While this is a feature still in preview and is yet to be fully released, if you have started to use it already, make sure to update references to inlineContentId in your code to use just contentId instead.
No other breaking changes are introduced. If you were not using the feature mentioned above, no changes are needed.
Full Changelog: https://github.com/resend/resend-node/compare/v5.0.0...v6.0.0
Fetched April 3, 2026