diff --git a/client/package.json b/client/package.json
index 200a300..cdf50b7 100644
--- a/client/package.json
+++ b/client/package.json
@@ -81,7 +81,6 @@
     "ts-pnp": "1.1.5",
     "uifx": "^2.0.7",
     "url-loader": "2.3.0",
-    "uuid": "7.0.3",
     "webpack": "4.41.2",
     "webpack-dev-server": "^3.11.2",
     "webpack-manifest-plugin": "2.2.0",
diff --git a/client/src/lib/utils.js b/client/src/lib/utils.js
index 60a1d56..146bfd7 100644
--- a/client/src/lib/utils.js
+++ b/client/src/lib/utils.js
@@ -102,3 +102,51 @@ export const clearInterval = (interval) => {
 export const now = () => (window.performance && window.performance.now
   ? window.performance.now.bind(window.performance)
   : Date.now)();
+
+const uuidByteToHex = Array.from(
+  { length: 256 },
+  (_, index) => (index + 0x100).toString(16).slice(1),
+);
+
+export const uuid = () => {
+  const crypto = window.crypto || window.msCrypto;
+
+  if (crypto && crypto.getRandomValues) {
+    const bytes = new Uint8Array(16);
+    crypto.getRandomValues(bytes);
+
+    /* eslint-disable no-bitwise */
+    bytes[6] = (bytes[6] & 0x0f) | 0x40;
+    bytes[8] = (bytes[8] & 0x3f) | 0x80;
+    /* eslint-enable no-bitwise */
+
+    return [
+      uuidByteToHex[bytes[0]],
+      uuidByteToHex[bytes[1]],
+      uuidByteToHex[bytes[2]],
+      uuidByteToHex[bytes[3]],
+      '-',
+      uuidByteToHex[bytes[4]],
+      uuidByteToHex[bytes[5]],
+      '-',
+      uuidByteToHex[bytes[6]],
+      uuidByteToHex[bytes[7]],
+      '-',
+      uuidByteToHex[bytes[8]],
+      uuidByteToHex[bytes[9]],
+      '-',
+      uuidByteToHex[bytes[10]],
+      uuidByteToHex[bytes[11]],
+      uuidByteToHex[bytes[12]],
+      uuidByteToHex[bytes[13]],
+      uuidByteToHex[bytes[14]],
+      uuidByteToHex[bytes[15]],
+    ].join('');
+  }
+
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (char) => {
+    const random = Math.floor(Math.random() * 16);
+    const value = char === 'x' ? random : ((random % 4) + 8);
+    return value.toString(16);
+  });
+};
diff --git a/client/src/lib/utils.test.js b/client/src/lib/utils.test.js
index 6c732c7..87c5229 100644
--- a/client/src/lib/utils.test.js
+++ b/client/src/lib/utils.test.js
@@ -1,4 +1,4 @@
-import { formatTime, parseTime } from './utils';
+import { formatTime, parseTime, uuid } from './utils';
 
 test('Handles DNF input', () => {
   expect(formatTime(undefined)).toBe('DNF');
@@ -46,3 +46,7 @@ test('Parser handles wrong input', () => {
   expect(parseTime()).toBe(undefined);
   expect(parseTime('a')).toBe(undefined);
 });
+
+test('Generates v4 UUIDs', () => {
+  expect(uuid()).toMatch(/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/);
+});
diff --git a/client/src/store/middlewares/rooms.js b/client/src/store/middlewares/rooms.js
index dc8a02a..7155296 100644
--- a/client/src/store/middlewares/rooms.js
+++ b/client/src/store/middlewares/rooms.js
@@ -1,9 +1,9 @@
 import { push } from 'connected-react-router';
-import { v4 as uuid } from 'uuid';
 import UIfx from 'uifx';
 import notificationAsset from '../../assets/notification.mp3';
 import * as Protocol from '../../lib/protocol';
 import Namespace from '../../lib/Namespace';
+import { uuid } from '../../lib/utils';
 import {
   DELETE_ROOM,
   JOIN_ROOM,
diff --git a/yarn.lock b/yarn.lock
index fe89a3b..e9281c2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -15558,11 +15558,6 @@ utils-merge@1.0.1, utils-merge@1.x.x, utils-merge@^1.0.1:
   resolved "https://registry.yarnpkg.com/utils-merge/-/utils-merge-1.0.1.tgz#9f95710f50a267947b2ccc124741c1028427e713"
   integrity sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==
 
-uuid@7.0.3:
-  version "7.0.3"
-  resolved "https://registry.yarnpkg.com/uuid/-/uuid-7.0.3.tgz#c5c9f2c8cf25dc0a372c4df1441c41f5bd0c680b"
-  integrity sha512-DPSke0pXhTZgoF/d+WSt2QaKMCFSfx7QegxEWT+JOuHF5aWrKEn0G+ztjuJg/gG8/ItK+rbPCD/yNv8yyih6Cg==
-
 uuid@^11.1.1:
   version "11.1.1"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-11.1.1.tgz#f6d81d2e1c65d00762e5e29b16c5d2d995e208ad"