diff --git a/data/web/telegram.org/js/telegram-web-app.js b/data/web/telegram.org/js/telegram-web-app.js
index 9dc635ed0f..6b32a355f1 100644
--- a/data/web/telegram.org/js/telegram-web-app.js
+++ b/data/web/telegram.org/js/telegram-web-app.js
@@ -284,6 +284,7 @@
   var webAppInitData = '', webAppInitDataUnsafe = {};
   var themeParams = {}, colorScheme = 'light';
   var webAppVersion = '6.0';
+  var webAppPlatform = 'unknown';
 
   if (initParams.tgWebAppData && initParams.tgWebAppData.length) {
     webAppInitData = initParams.tgWebAppData;
@@ -314,6 +315,9 @@
   if (initParams.tgWebAppVersion) {
     webAppVersion = initParams.tgWebAppVersion;
   }
+  if (initParams.tgWebAppPlatform) {
+    webAppPlatform = initParams.tgWebAppPlatform;
+  }
 
   function onThemeChanged(eventType, eventData) {
     if (eventData.theme_params) {
@@ -986,6 +990,10 @@
     get: function(){ return webAppVersion; },
     enumerable: true
   });
+  Object.defineProperty(WebApp, 'platform', {
+    get: function(){ return webAppPlatform; },
+    enumerable: true
+  });
   Object.defineProperty(WebApp, 'colorScheme', {
     get: function(){ return colorScheme; },
     enumerable: true
diff --git a/data/web/webappcontent.telegram.org/cafe.html b/data/web/webappcontent.telegram.org/cafe.html
index 4a45e839a5..51002669b3 100644
--- a/data/web/webappcontent.telegram.org/cafe.html
+++ b/data/web/webappcontent.telegram.org/cafe.html
@@ -9,7 +9,7 @@
     <meta name="MobileOptimized" content="176" />
     <meta name="HandheldFriendly" content="True" />
     <meta name="robots" content="noindex, nofollow" />
-    <script src="https://tg.dev/js/telegram-web-app.js?24"></script>
+    <script src="https://tg.dev/js/telegram-web-app.js?25"></script>
     <script>
       function setThemeClass() {
         document.documentElement.className = Telegram.WebApp.colorScheme;
diff --git a/data/web/webappcontent.telegram.org/demo.html b/data/web/webappcontent.telegram.org/demo.html
index 14e784d100..8670f168e7 100644
--- a/data/web/webappcontent.telegram.org/demo.html
+++ b/data/web/webappcontent.telegram.org/demo.html
@@ -8,7 +8,7 @@
     <meta name="MobileOptimized" content="176" />
     <meta name="HandheldFriendly" content="True" />
     <meta name="robots" content="noindex,nofollow" />
-    <script src="https://tg.dev/js/telegram-web-app.js?24"></script>
+    <script src="https://tg.dev/js/telegram-web-app.js?25"></script>
     <script>
       function setThemeClass() {
         document.documentElement.className = Telegram.WebApp.colorScheme;
@@ -92,7 +92,8 @@
       Theme params
     </div>
     <div class="hint">
-      Version: <span id="ver"></span>
+      Version: <span id="ver"></span>,
+      platform: <span id="platform"></span>
     </div>
   </section>
   <div class="viewport-border"></div>
@@ -114,6 +115,7 @@ $('#regular_link').attr('href', $('#regular_link').attr('href') + location.hash)
 $('#text_field').focus();
 
 $('#ver').text(Telegram.WebApp.version);
+$('#platform').text(Telegram.WebApp.platform);
 
 if (DemoApp.initDataUnsafe.receiver) {
   $('#peer_wrap').show();