diff --git a/package.json b/package.json
index 1ee5477..f9b2325 100644
--- a/package.json
+++ b/package.json
@@ -143,7 +143,7 @@
     "typedoc": "^0.5.7",
     "typescript": "^2.2.1",
     "webpack": "^2.2.1",
-    "webpack-merge": "^3.0.0"
+    "webpack-merge": "^4.2.1"
   },
   "babel": {
     "env": {