You need to run the versions I specify in the course to follow along with the course. 1. Delete node_modules 2. Copy the dependencies and devDependencies from [the package.json that I provide in the course](https://gist.github.com/coryhouse/29bd1029b623beb4c7f79b748dcba844) 3. Run this to install dependencies: `npm install` 4. Once you complete the course, I show how to update to the latest versions [here](https://github.com/coryhouse/javascript-development-environment/pull/7).