Autoprefixer 6.0 uses PostCSS 5.0 and Browserslist 1.0 and brings many new prefixes. The big change in Autoprefixer 6.0 is that we removed the CLI and join autoprefixer and autoprefixer-core packages. Find and replace autoprefixer-core with autoprefixer in your package.json. The official CLI for Autoprefixer is postcss-cli, because we should be cooperative with the PostCSS ecosystem, where CSS rev