# Builder-Webpack5 Builder implemented with `webpack5` and `webpack5`-compatible loaders/plugins/config, used by `@storybook/core-server` to build the preview iframe. To configure your Storybook to run `builder-webpack5`, install it as a dev dependency and then update your `.storybook/main.js` configuration: ```js module.exports = { core: { builder: 'webpack5', }, }; ```