diff --git a/faststream_outbox/__init__.py b/faststream_outbox/__init__.py
index 6bec73a..26e003c 100644
--- a/faststream_outbox/__init__.py
+++ b/faststream_outbox/__init__.py
@@ -1,3 +1,10 @@
+import functools
+import typing
+
+import faststream.asgi.factories.asyncapi.try_it_out
+from faststream._internal.broker import BrokerUsecase
+from faststream._internal.testing.broker import TestBroker
+
 from faststream_outbox.broker import OutboxBroker
 from faststream_outbox.retry import (
     ConstantRetry,
@@ -22,3 +29,14 @@
     "TestOutboxBroker",
     "make_outbox_table",
 ]
+
+try:
+    original_get_broker_registry = faststream.asgi.factories.asyncapi.try_it_out._get_broker_registry  # noqa: SLF001
+
+    @functools.lru_cache(maxsize=1)
+    def get_broker_registry() -> dict[type[BrokerUsecase[typing.Any, typing.Any]], type[TestBroker[typing.Any]]]:
+        return {**original_get_broker_registry(), OutboxBroker: TestOutboxBroker}  # ty: ignore[invalid-return-type]
+
+    faststream.asgi.factories.asyncapi.try_it_out._get_broker_registry = get_broker_registry  # noqa: SLF001
+except Exception:  # noqa: BLE001, S110  # pragma: no cover
+    pass
diff --git a/tests/test_unit.py b/tests/test_unit.py
index 414cf1c..37dd31a 100644
--- a/tests/test_unit.py
+++ b/tests/test_unit.py
@@ -3,6 +3,7 @@
 import uuid
 from unittest.mock import AsyncMock, MagicMock, patch
 
+import faststream.asgi.factories.asyncapi.try_it_out
 import pytest
 from pydantic import BaseModel
 from sqlalchemy import MetaData
@@ -16,6 +17,7 @@
     NoRetry,
     OutboxBroker,
     OutboxRouter,
+    TestOutboxBroker,
     make_outbox_table,
 )
 from faststream_outbox.client import OutboxClient
@@ -25,6 +27,11 @@
 from faststream_outbox.subscriber.usecase import OutboxSubscriber
 
 
+def test_outbox_broker_registered_in_try_it_out_registry() -> None:
+    registry = faststream.asgi.factories.asyncapi.try_it_out._get_broker_registry()  # noqa: SLF001
+    assert registry[OutboxBroker] is TestOutboxBroker  # ty: ignore[invalid-argument-type]
+
+
 def _make_broker(engine: object | None = None, table_name: str = "outbox") -> OutboxBroker:
     metadata = MetaData()
     table = make_outbox_table(metadata, table_name=table_name)