diff --git a/polling-app-client/package-lock.json b/polling-app-client/package-lock.json
index 6fee8cea..00529d47 100644
--- a/polling-app-client/package-lock.json
+++ b/polling-app-client/package-lock.json
@@ -4157,7 +4157,8 @@
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -4175,11 +4176,13 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -4192,15 +4195,18 @@
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -4303,7 +4309,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -4313,6 +4320,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -4325,17 +4333,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.2.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.1",
             "yallist": "^3.0.0"
@@ -4352,6 +4363,7 @@
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -4424,7 +4436,8 @@
         },
         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -4434,6 +4447,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -4509,7 +4523,8 @@
         },
         "safe-buffer": {
           "version": "5.1.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -4539,6 +4554,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -4556,6 +4572,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -4594,11 +4611,13 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         }
       }
     },
@@ -9311,14 +9330,14 @@
       }
     },
     "react-dom": {
-      "version": "16.5.2",
-      "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-16.5.2.tgz",
-      "integrity": "sha512-RC8LDw8feuZOHVgzEf7f+cxBr/DnKdqp56VU0lAs1f4UfKc4cU8wU4fTq/mgnvynLQo8OtlPC19NUFh/zjZPuA==",
+      "version": "16.9.0",
+      "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-16.9.0.tgz",
+      "integrity": "sha512-YFT2rxO9hM70ewk9jq0y6sQk8cL02xm4+IzYBz75CQGlClQQ1Bxq0nhHF6OtSbit+AIahujJgb/CPRibFkMNJQ==",
       "requires": {
         "loose-envify": "^1.1.0",
         "object-assign": "^4.1.1",
         "prop-types": "^15.6.2",
-        "schedule": "^0.5.0"
+        "scheduler": "^0.15.0"
       }
     },
     "react-error-overlay": {
@@ -10204,6 +10223,15 @@
         "object-assign": "^4.1.1"
       }
     },
+    "scheduler": {
+      "version": "0.15.0",
+      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.15.0.tgz",
+      "integrity": "sha512-xAefmSfN6jqAa7Kuq7LIJY0bwAPG3xlCj0HMEBQk1lxYiDKZscY2xJ5U/61ZTrYbmNQbXa+gc7czPkVo11tnCg==",
+      "requires": {
+        "loose-envify": "^1.1.0",
+        "object-assign": "^4.1.1"
+      }
+    },
     "schema-utils": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-0.3.0.tgz",
diff --git a/polling-app-client/package.json b/polling-app-client/package.json
index 0a77fab2..6f597e3e 100644
--- a/polling-app-client/package.json
+++ b/polling-app-client/package.json
@@ -5,7 +5,7 @@
   "dependencies": {
     "antd": "^3.2.2",
     "react": "^16.5.2",
-    "react-dom": "^16.5.2",
+    "react-dom": "^16.9.0",
     "react-router-dom": "^4.3.1",
     "react-scripts": "1.1.5"
   },