diff --git a/package-lock.json b/package-lock.json
index a2b66d7..d7b0018 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,6 +18,7 @@
         "reactstrap": "^9.2.1"
       },
       "devDependencies": {
+        "@babel/plugin-proposal-private-property-in-object": "^7.21.11",
         "eslint": "^8.57.1",
         "eslint-plugin-react": "^7.37.2",
         "globals": "^15.12.0",
@@ -662,10 +663,17 @@
       }
     },
     "node_modules/@babel/plugin-proposal-private-property-in-object": {
-      "version": "7.21.0-placeholder-for-preset-env.2",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-private-property-in-object/-/plugin-proposal-private-property-in-object-7.21.0-placeholder-for-preset-env.2.tgz",
-      "integrity": "sha512-SOSkfJDddaM7mak6cPEpswyTRnuRltl429hMraQEglW+OkovnCzsiszTmsrlY//qLFjCpQDFRvjdm2wA5pPm9w==",
+      "version": "7.21.11",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-private-property-in-object/-/plugin-proposal-private-property-in-object-7.21.11.tgz",
+      "integrity": "sha512-0QZ8qP/3RLDVBwBFoWAwCtgcDZJVwA5LUJRZU8x2YFfKNuFq161wK3cuGrALu5yiPu+vzwTAg/sMWVNeWeNyaw==",
+      "deprecated": "This proposal has been merged to the ECMAScript standard and thus this plugin is no longer maintained. Please use @babel/plugin-transform-private-property-in-object instead.",
       "dev": true,
+      "dependencies": {
+        "@babel/helper-annotate-as-pure": "^7.18.6",
+        "@babel/helper-create-class-features-plugin": "^7.21.0",
+        "@babel/helper-plugin-utils": "^7.20.2",
+        "@babel/plugin-syntax-private-property-in-object": "^7.14.5"
+      },
       "engines": {
         "node": ">=6.9.0"
       },
@@ -1981,6 +1989,18 @@
         "@babel/core": "^7.0.0-0"
       }
     },
+    "node_modules/@babel/preset-env/node_modules/@babel/plugin-proposal-private-property-in-object": {
+      "version": "7.21.0-placeholder-for-preset-env.2",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-private-property-in-object/-/plugin-proposal-private-property-in-object-7.21.0-placeholder-for-preset-env.2.tgz",
+      "integrity": "sha512-SOSkfJDddaM7mak6cPEpswyTRnuRltl429hMraQEglW+OkovnCzsiszTmsrlY//qLFjCpQDFRvjdm2wA5pPm9w==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      },
+      "peerDependencies": {
+        "@babel/core": "^7.0.0-0"
+      }
+    },
     "node_modules/@babel/preset-env/node_modules/semver": {
       "version": "6.3.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
diff --git a/package.json b/package.json
index 567aaad..1263c50 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     ]
   },
   "devDependencies": {
+    "@babel/plugin-proposal-private-property-in-object": "^7.21.11",
     "eslint": "^8.57.1",
     "eslint-plugin-react": "^7.37.2",
     "globals": "^15.12.0",
diff --git a/src/App.test.js b/src/App.test.js
index 65d4fab..8fd70d2 100644
--- a/src/App.test.js
+++ b/src/App.test.js
@@ -1,9 +1,12 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
-//import App from './App';
+//import ReactDOM from 'react-dom';
+import App from './App';
 
 it('renders without crashing', () => {
   const div = document.createElement('div');
   //ReactDOM.render(<App />, div);
-  ReactDOM.unmountComponentAtNode(div);
+  const root = createRoot(div);
+  root.render(<App />);
+  //ReactDOM.unmountComponentAtNode(div);
+  root.unmount();
 });