diff --git a/demo_1/package-lock.json b/demo_1/package-lock.json
index 6e295f5..08e24be 100644
--- a/demo_1/package-lock.json
+++ b/demo_1/package-lock.json
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+            "camelcase": "^4.1.0"
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+      "resolved": "https://registry.npmjs.org/webpack-log/-/webpack-log-2.0.0.tgz",
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@@ -17110,20 +17672,20 @@
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       "dev": true,
       "requires": {
-        "http-parser-js": ">=0.4.0 <0.4.11",
+        "http-parser-js": ">=0.5.1",
         "safe-buffer": ">=5.1.0",
         "websocket-extensions": ">=0.1.1"
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diff --git a/demo_1/package.json b/demo_1/package.json
index 5a4402b..ec82945 100644
--- a/demo_1/package.json
+++ b/demo_1/package.json
@@ -110,7 +110,7 @@
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     "webpack": "^3.6.0",
     "webpack-bundle-analyzer": "^2.9.0",
-    "webpack-dev-server": "^2.11.5",
+    "webpack-dev-server": "^3.1.11",
     "webpack-merge": "^4.2.1"
   },
   "engines": {