diff --git a/demo/package-lock.json b/demo/package-lock.json
index ff1aa6d..3a8f88d 100644
--- a/demo/package-lock.json
+++ b/demo/package-lock.json
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-              "resolved": "http://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
+              "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
               "integrity": "sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=",
               "requires": {
                 "kind-of": "3.2.2"
@@ -13151,7 +13176,7 @@
       "dependencies": {
         "kind-of": {
           "version": "2.0.1",
-          "resolved": "http://registry.npmjs.org/kind-of/-/kind-of-2.0.1.tgz",
+          "resolved": "https://registry.npmjs.org/kind-of/-/kind-of-2.0.1.tgz",
           "integrity": "sha1-AY7HpM5+OobLkUG+UZ0kyPqpgbU=",
           "requires": {
             "is-buffer": "1.1.6"
@@ -13682,7 +13707,7 @@
     },
     "strip-ansi": {
       "version": "3.0.1",
-      "resolved": "http://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "requires": {
         "ansi-regex": "2.1.1"
@@ -14176,7 +14201,7 @@
       "dependencies": {
         "cacache": {
           "version": "10.0.4",
-          "resolved": "http://registry.npmjs.org/cacache/-/cacache-10.0.4.tgz",
+          "resolved": "https://registry.npmjs.org/cacache/-/cacache-10.0.4.tgz",
           "integrity": "sha512-Dph0MzuH+rTQzGPNT9fAnrPmMmjKfST6trxJeK7NQuHRaVw24VzPRWTmg9MpcwOVQZO0E1FBICUlFeNaKPIfHA==",
           "requires": {
             "bluebird": "3.5.3",
@@ -14721,7 +14746,7 @@
             },
             "is-accessor-descriptor": {
               "version": "0.1.6",
-              "resolved": "http://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz",
+              "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-0.1.6.tgz",
               "integrity": "sha1-qeEss66Nh2cn7u84Q/igiXtcmNY=",
               "requires": {
                 "kind-of": "3.2.2"
@@ -14739,7 +14764,7 @@
             },
             "is-data-descriptor": {
               "version": "0.1.4",
-              "resolved": "http://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
+              "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz",
               "integrity": "sha1-C17mSDiOLIYCgueT8YVv7D8wG1Y=",
               "requires": {
                 "kind-of": "3.2.2"
@@ -15391,7 +15416,7 @@
         },
         "string-width": {
           "version": "1.0.2",
-          "resolved": "http://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
           "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
           "requires": {
             "code-point-at": "1.1.0",
@@ -15464,7 +15489,7 @@
     },
     "yargs": {
       "version": "11.1.0",
-      "resolved": "http://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-11.1.0.tgz",
       "integrity": "sha512-NwW69J42EsCSanF8kyn5upxvjp5ds+t3+udGBeTbFnERA+lF541DDpMawzo4z6W/QrzNM18D+BPMiOBibnFV5A==",
       "requires": {
         "cliui": "4.1.0",
diff --git a/demo/package.json b/demo/package.json
index 0aa587e..125a4bb 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -5,7 +5,7 @@
   "dependencies": {
     "@material-ui/core": "^3.4.0",
     "@material-ui/icons": "^3.0.1",
-    "axios": "^0.18.0",
+    "axios": "^0.21.1",
     "material-ui-slider": "^3.0.0",
     "react": "^16.6.1",
     "react-dom": "^16.6.1",