RubyWorld Conference 2023, now in its 15th year, has been decided to be held offline in Matsue City, Shimane Prefecture. We hope that it will be an opportunity to think about how Ruby fits into and penetrates the diverse real world, such a popularization process and growth, and to disseminate information such as advanced use cases, the latest technology trends, and the status of developer education as in the past. We hope that it will be a place where you can know the Ruby ecosystem (ecosystem). And we aim to spread the use of Ruby in more technical areas and research.