diff --git a/package-lock.json b/package-lock.json
index 59cf990..383e1ec 100644
--- a/package-lock.json
+++ b/package-lock.json
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@@ -1677,6 +1681,17 @@
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@@ -4119,9 +3607,9 @@
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-      "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.4.tgz",
+      "integrity": "sha512-OqedPIGOfsDlo31UNwYbCFMSaO9m9G/0faIHj5/dZFDMFqPTcx6UwqyOy3COEaEOg/9VsGIpdqn62W5KhoKSpg==",
       "dev": true
     },
     "which": {
diff --git a/package.json b/package.json
index 09ce10a..58c9896 100644
--- a/package.json
+++ b/package.json
@@ -37,12 +37,16 @@
     "babel-preset-env": "^1.7.0",
     "babel-preset-react": "^6.24.1",
     "css-loader": "^3.4.2",
+    "fsevents": "^2.1.3",
     "html-webpack-plugin": "^4.0.4",
+    "minimist": ">=1.2.3",
+    "mkdirp": "1.0.4",
     "querystringify": ">=2.1.1",
     "style-loader": "^1.1.3",
     "webpack": "^4.42.1",
     "webpack-cli": "^3.3.11",
     "webpack-dev-middleware": "^3.7.2",
-    "webpack-dev-server": "^3.10.3"
+    "webpack-dev-server": "^3.11.0",
+    "websocket-extensions": ">=0.1.4"
   }
 }