diff --git a/demo/package.json b/demo/package.json
index 7101a77..cc611e1 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -78,7 +78,7 @@
     "tslint": "~5.11.0",
     "typescript": "~3.2.2",
     "webpack-cli": "^3.2.1",
-    "yargs": "12.0.1"
+    "yargs": "15.3.1"
   },
   "jest": {
     "preset": "jest-preset-angular",