npm package upgrades

package.json

@@ -8,21 +8,21 @@
 	"dependencies": {
 		"element-closest": "2.0.2",
 		"flexismooth": "1.0.0",
-		"prismjs": "1.6.0",
-		"whatwg-fetch": "2.0.3"
+		"prismjs": "1.15.0",
+		"whatwg-fetch": "3.0.0"
 	},
 	"devDependencies": {
-		"del": "^2.2.1",
-		"gulp": "gulpjs/gulp.git#4.0",
-		"gulp-autoprefixer": "^4.0.0",
-		"gulp-clean-css": "^3.4.1",
+		"del": "^3.0.0",
+		"gulp": "^4.0.0",
+		"gulp-autoprefixer": "^6.0.0",
+		"gulp-clean-css": "^3.10.0",
 		"gulp-concat": "^2.6.0",
-		"gulp-header": "^1.8.7",
+		"gulp-header": "^2.0.5",
 		"gulp-include": "^2.3.1",
 		"gulp-preservetime": "^1.0.0",
 		"gulp-refresh": "^1.1.0",
-		"gulp-rename": "^1.2.2",
-		"gulp-sass": "^3.1.0",
-		"gulp-uglify": "^3.0.0"
+		"gulp-rename": "^1.4.0",
+		"gulp-sass": "^4.0.2",
+		"gulp-uglify": "^3.0.1"
 	}
 }