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# uninstall previous Gulp installation, if any
$ npm uninstall gulp -g
$ cd [your_project_root]
$ npm uninstall gulp

# install Gulp 4 CLI tools globally from 4.0 GitHub branch
$ npm install gulpjs/gulp-cli#4.0 -g

# install Gulp 4 into your project
$ npm install gulpjs/gulp.git#4.0 --save-dev