diff --git a/lib/src/extensions.dart b/lib/src/extensions.dart
index 68c62c0..9db5b98 100644
--- a/lib/src/extensions.dart
+++ b/lib/src/extensions.dart
@@ -46,6 +46,7 @@ extension ProtocolVersionExt on ProtocolVersion {
         ProtocolVersion.v6: '6',
         ProtocolVersion.v7: '7',
         ProtocolVersion.v8: '8',
+        ProtocolVersion.v9: '9',
       }[this]!;
 }
 
diff --git a/lib/src/options.dart b/lib/src/options.dart
index 561e83c..dfd4f8b 100644
--- a/lib/src/options.dart
+++ b/lib/src/options.dart
@@ -44,7 +44,7 @@ class ConnectOptions {
   const ConnectOptions({
     this.autoSubscribe = true,
     this.rtcConfiguration = const RTCConfiguration(),
-    this.protocolVersion = ProtocolVersion.v8,
+    this.protocolVersion = ProtocolVersion.v9,
     this.timeouts = Timeouts.defaultTimeouts,
   });
 }
diff --git a/lib/src/types/other.dart b/lib/src/types/other.dart
index 7f5636e..1b5aaf6 100644
--- a/lib/src/types/other.dart
+++ b/lib/src/types/other.dart
@@ -15,6 +15,7 @@ enum ProtocolVersion {
   v6, // Session migration
   v7, // Remote unpublish
   v8,
+  v9,
 }
 
 /// Connection state type used throughout the SDK.