Hi folks! We are on a road to make kotlinx-metadata-jvm library stable and easy to use. As a part of this effort, we've released new 0.6.0 version with several breaking changes, including deprecation of Visitor API. If you have some usages for it, I kindly ask you to try updating on a new version and see if a migration is successful. You can find migration guide and changelog here: https://github.com/JetBrains/kotlin/blob/d646906437aa9afe693723c87f86eaa7b8330246/libraries/kotlinx-metadata/jvm/ChangeLog.md#060 , https://github.com/JetBrains/kotlin/blob/d646906437aa9afe693723c87f86eaa7b8330246/libraries/kotlinx-metadata/jvm/Migration.md. If you stumble into problems, please create a YouTrack issue.