diff --git a/package.json b/package.json
index 1c136ce144..c9ba6354a5 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,8 @@
     "typescript": "^3.5.3",
     "url-loader": "^1.1.2",
     "webpack": "^4.39.1",
-    "webpack-cli": "^3.3.6"
+    "webpack-cli": "^3.3.6",
+    "ws": "^7.0.0"
   },
   "peerDependencies": {
     "webpack": "^4.0.0"