diff --git a/tests/ext/fastapi/test_dapractor.py b/tests/ext/fastapi/test_dapractor.py
index ee863d726..f3e2f82ca 100644
--- a/tests/ext/fastapi/test_dapractor.py
+++ b/tests/ext/fastapi/test_dapractor.py
@@ -20,6 +20,31 @@
 
 from dapr.ext.fastapi.actor import DaprActor, _wrap_response
 
+EXPECTED_ACTOR_PATHS = {
+    '/healthz',
+    '/dapr/config',
+    '/actors/{actor_type_name}/{actor_id}',
+    '/actors/{actor_type_name}/{actor_id}/method/{method_name}',
+    '/actors/{actor_type_name}/{actor_id}/method/timer/{timer_name}',
+    '/actors/{actor_type_name}/{actor_id}/method/remind/{reminder_name}',
+}
+
+
+def _operation_tags(app: FastAPI) -> list[tuple[str, list[str] | None]]:
+    """Returns the ``(path, tags)`` pair of every operation in the app's OpenAPI schema.
+
+    The schema is read instead of ``app.router.routes`` because FastAPI 0.137+ stores
+    routes registered via ``include_router`` in a nested tree rather than a flat list, so
+    the actor routes no longer surface as top-level ``APIRoute`` objects. The OpenAPI
+    schema is the public, stable surface that ``router_tags`` is meant to drive.
+    """
+    schema = app.openapi()
+    return [
+        (path, operation.get('tags'))
+        for path, operations in schema['paths'].items()
+        for operation in operations.values()
+    ]
+
 
 class DaprActorTest(unittest.TestCase):
     def test_wrap_response_str(self):
@@ -52,37 +77,20 @@ def test_router_tag(self):
         DaprActor(app=app2)
         DaprActor(app=app3, router_tags=None)
 
-        PATHS_WITH_EXPECTED_TAGS = [
-            '/healthz',
-            '/dapr/config',
-            '/actors/{actor_type_name}/{actor_id}',
-            '/actors/{actor_type_name}/{actor_id}/method/{method_name}',
-            '/actors/{actor_type_name}/{actor_id}/method/timer/{timer_name}',
-            '/actors/{actor_type_name}/{actor_id}/method/remind/{reminder_name}',
-        ]
-
-        foundTags = False
-        for route in app1.router.routes:
-            if hasattr(route, 'tags'):
-                self.assertIn(route.path, PATHS_WITH_EXPECTED_TAGS)
-                self.assertEqual(['MyTag', 'Actor'], route.tags)
-                foundTags = True
-        if not foundTags:
-            self.fail('No tags found')
-
-        foundTags = False
-        for route in app2.router.routes:
-            if hasattr(route, 'tags'):
-                self.assertIn(route.path, PATHS_WITH_EXPECTED_TAGS)
-                self.assertEqual(['Actor'], route.tags)
-                foundTags = True
-        if not foundTags:
-            self.fail('No tags found')
-
-        for route in app3.router.routes:
-            if hasattr(route, 'tags'):
-                if len(route.tags) > 0:
-                    self.fail('Found tags on route that should not have any')
+        custom_tag_operations = _operation_tags(app1)
+        self.assertEqual(EXPECTED_ACTOR_PATHS, {path for path, _tags in custom_tag_operations})
+        for _path, tags in custom_tag_operations:
+            self.assertEqual(['MyTag', 'Actor'], tags)
+
+        default_tag_operations = _operation_tags(app2)
+        self.assertEqual(EXPECTED_ACTOR_PATHS, {path for path, _tags in default_tag_operations})
+        for _path, tags in default_tag_operations:
+            self.assertEqual(['Actor'], tags)
+
+        untagged_operations = _operation_tags(app3)
+        self.assertEqual(EXPECTED_ACTOR_PATHS, {path for path, _tags in untagged_operations})
+        for _path, tags in untagged_operations:
+            self.assertFalse(tags)
 
 
 if __name__ == '__main__':
diff --git a/uv.lock b/uv.lock
index 9f7a907b7..76475cabb 100644
--- a/uv.lock
+++ b/uv.lock
@@ -850,7 +850,7 @@ wheels = [
 
 [[package]]
 name = "fastapi"
-version = "0.135.1"
+version = "0.138.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "annotated-doc" },
@@ -859,9 +859,9 @@ dependencies = [
     { name = "typing-extensions" },
     { name = "typing-inspection" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e7/7b/f8e0211e9380f7195ba3f3d40c292594fd81ba8ec4629e3854c353aaca45/fastapi-0.135.1.tar.gz", hash = "sha256:d04115b508d936d254cea545b7312ecaa58a7b3a0f84952535b4c9afae7668cd", size = 394962, upload-time = "2026-03-01T18:18:29.369Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/5b/58/ff455d9fe47c60abadb34b9e05a304b1f05f5ab8000ac01565156b6f5e43/fastapi-0.138.0.tar.gz", hash = "sha256:d445a4877636ad191e7053e08c9bf98cb921a6756776848400bb773d1740c061", size = 419240, upload-time = "2026-06-20T01:18:05.259Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e4/72/42e900510195b23a56bde950d26a51f8b723846bfcaa0286e90287f0422b/fastapi-0.135.1-py3-none-any.whl", hash = "sha256:46e2fc5745924b7c840f71ddd277382af29ce1cdb7d5eab5bf697e3fb9999c9e", size = 116999, upload-time = "2026-03-01T18:18:30.831Z" },
+    { url = "https://files.pythonhosted.org/packages/6c/ff/8496d9847a5fedae775eb49460722d3efaa80487854273e9647ae876218c/fastapi-0.138.0-py3-none-any.whl", hash = "sha256:b6f54fd1bd72c80b0f899f172c61a600f6f7af9b43d4d772a018f35624048cb0", size = 126779, upload-time = "2026-06-20T01:18:03.483Z" },
 ]
 
 [[package]]