diff --git a/package.json b/package.json
index 151535c826..1053083ed8 100644
--- a/package.json
+++ b/package.json
@@ -13,6 +13,10 @@
     "type": "git",
     "url": "git+https://github.com/phpbb/phpbb.git"
   },
+  "browserslist": [
+    "> 1%",
+    "last 2 versions"
+  ],
   "keywords": [
     "phpBB",
     "phpbb",
@@ -30,5 +34,19 @@
   "devDependencies": {
     "stylelint": "8.0.0",
     "stylelint-order": "0.3.0"
+  },
+  "dependencies": {
+    "del": "^3.0.0",
+    "gulp": "^3.9.1",
+    "gulp-autoprefixer": "^4.0.0",
+    "gulp-cssnano": "^2.1.2",
+    "gulp-postcss": "^7.0.0",
+    "gulp-rename": "^1.2.2",
+    "gulp-sass": "^3.1.0",
+    "gulp-sourcemaps": "^2.6.1",
+    "gulp-stylefmt": "^1.1.0",
+    "postcss-import": "^11.0.0",
+    "postcss-pxtorem": "^4.0.1",
+    "postcss-sorting": "^3.0.2"
   }
 }