diff --git a/UI/WebServerResources/package.json b/UI/WebServerResources/package.json
index a2b523988..9c10c36ef 100644
--- a/UI/WebServerResources/package.json
+++ b/UI/WebServerResources/package.json
@@ -3,6 +3,8 @@
   "version": "0.0.1",
   "devDependencies": {
     "bower": ">=1.3.8",
+    "autoprefixer-core": ">=5.1.0",
+    "csswring": ">=3.0.0",
     "grunt": ">=0.4.1",
     "grunt-cli": ">=0.1.11",
     "grunt-contrib-sass": ">=0.8.0",