diff --git a/packages/protocol/src/models/heartbeat.ts b/packages/protocol/src/models/heartbeat.ts
new file mode 100644
index 000000000..06ffb0089
--- /dev/null
+++ b/packages/protocol/src/models/heartbeat.ts
@@ -0,0 +1 @@
+export type HeartbeatFormat = 'legacy' | 'message';
diff --git a/packages/protocol/src/models/index.ts b/packages/protocol/src/models/index.ts
index 3a755f35f..eb070e98a 100644
--- a/packages/protocol/src/models/index.ts
+++ b/packages/protocol/src/models/index.ts
@@ -11,3 +11,4 @@ export {
     SignDataFeature
 } from './feature';
 export { CHAIN } from './CHAIN';
+export { HeartbeatFormat } from './heartbeat';
diff --git a/packages/sdk/src/provider/bridge/bridge-gateway.ts b/packages/sdk/src/provider/bridge/bridge-gateway.ts
index f06612bcf..e44e0809b 100644
--- a/packages/sdk/src/provider/bridge/bridge-gateway.ts
+++ b/packages/sdk/src/provider/bridge/bridge-gateway.ts
@@ -284,6 +284,7 @@ async function createEventSource(config: CreateEventSourceConfig): Promise<Event
             if (lastEventId) {
                 url.searchParams.append('last_event_id', lastEventId);
             }
+            url.searchParams.append('heartbeat', 'message');
 
             if (signal.aborted) {
                 reject(new TonConnectError('Bridge connection aborted'));