The BuckleScript compiler recently reached a new milestone with version 7. In this lesson, we walk through the process of upgrading an existing application to the latest version using `yarn` (or `npm`). ### Resources [BuckleScript Blog - What's new in v7](https://bucklescript.github.io/blog/2019/11/18/whats-new-in-7) [BuckleScript Blog - Holiday Release Post](https://bucklescript.github.io/blog/2019/12/20/release-7-02) !