diff --git a/packages/genui_a2ui/lib/src/a2ui_agent_connector.dart b/packages/genui_a2ui/lib/src/a2ui_agent_connector.dart
index 48754846a..335e8e58b 100644
--- a/packages/genui_a2ui/lib/src/a2ui_agent_connector.dart
+++ b/packages/genui_a2ui/lib/src/a2ui_agent_connector.dart
@@ -130,7 +130,7 @@ class A2uiAgentConnector {
     }
 
     final payload = A2AMessageSendParams()..message = message;
-    payload.extensions = ['https://a2ui.org/ext/a2a-ui/v0.1'];
+    payload.extensions = ['https://a2ui.org/a2a-extension/a2ui/v0.8'];
 
     _log.info('--- OUTGOING REQUEST ---');
     _log.info('URL: ${url.toString()}');
@@ -232,7 +232,7 @@ class A2uiAgentConnector {
       ..referenceTaskIds = [taskId!];
 
     final payload = A2AMessageSendParams()..message = message;
-    payload.extensions = ['https://a2ui.org/ext/a2a-ui/v0.1'];
+    payload.extensions = ['https://a2ui.org/a2a-extension/a2ui/v0.8'];
 
     try {
       await client.sendMessage(payload);