diff --git a/package.json b/package.json
index 417b5f4e3..bdf832aa9 100644
--- a/package.json
+++ b/package.json
@@ -71,6 +71,7 @@
     "jsdoc": "^3.6.6",
     "node-sloc": "^0.1.12",
     "remove-files-webpack-plugin": "^1.4.4",
+    "source-map": "^0.7.3",
     "typescript": "^4.0.3",
     "uglifyjs-webpack-plugin": "^2.2.0",
     "vivid-cli": "^1.1.2",