diff --git a/demo/package-lock.json b/demo/package-lock.json
index c49efb6..53ff401 100644
--- a/demo/package-lock.json
+++ b/demo/package-lock.json
@@ -15,6 +15,8 @@
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@@ -1411,10 +1429,14 @@
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@@ -2389,6 +2448,64 @@
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       "version": "4.29.4",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.29.4.tgz",
+      "integrity": "sha512-Uu/QgPFZG+w+5wjWIFBgIy+g9vOF3QiLmT2Bl783MQSLjRF/K+GMv2TH3TVNFyPQVEHY8rVnPoQtcqrnqK2H7Q==",
       "dev": true,
       "requires": {
         "@webassemblyjs/ast": "1.8.2",
@@ -8246,6 +10227,8 @@
     },
     "webpack-cli": {
       "version": "3.2.3",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-3.2.3.tgz",
+      "integrity": "sha512-Ik3SjV6uJtWIAN5jp5ZuBMWEAaP5E4V78XJ2nI+paFPh8v4HPSwo/myN0r29Xc/6ZKnd2IdrAlpSgNOu2CDQ6Q==",
       "dev": true,
       "requires": {
         "chalk": "^2.4.1",
@@ -8283,6 +10266,8 @@
     },
     "webpack-dev-server": {
       "version": "3.1.14",
+      "resolved": "https://registry.npmjs.org/webpack-dev-server/-/webpack-dev-server-3.1.14.tgz",
+      "integrity": "sha512-mGXDgz5SlTxcF3hUpfC8hrQ11yhAttuUQWf1Wmb+6zo3x6rb7b9mIfuQvAPLdfDRCGRGvakBWHdHOa0I9p/EVQ==",
       "dev": true,
       "requires": {
         "ansi-html": "0.0.7",
@@ -8413,6 +10398,8 @@
     },
     "webpack-merge": {
       "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.2.1.tgz",
+      "integrity": "sha512-4p8WQyS98bUJcCvFMbdGZyZmsKuWjWVnVHnAS3FFg0HDaRVrPbkivx2RYCre8UiemD67RsiFFLfn4JhLAin8Vw==",
       "dev": true,
       "requires": {
         "lodash": "^4.17.5"
diff --git a/demo/yarn.lock b/demo/yarn.lock
index b292fc8..ed436a0 100644
--- a/demo/yarn.lock
+++ b/demo/yarn.lock
@@ -769,9 +769,9 @@ acorn-jsx@^5.0.0:
   integrity sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==
 
 acorn@^6.0.5, acorn@^6.0.7:
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.1.0.tgz#b0a3be31752c97a0f7013c5f4903b71a05db6818"
-  integrity sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw==
+  version "6.4.1"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-6.4.1.tgz#531e58ba3f51b9dacb9a6646ca4debf5b14ca474"
+  integrity sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==
 
 ajv-errors@^1.0.0:
   version "1.0.1"