diff --git a/CHANGELOG.md b/CHANGELOG.md
index 14d1f5c0..74c9e7f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,12 +19,15 @@ and this project adheres to
 - ⬆️(backend) bump lodash from 4.17.23 to 4.18.1 in /src/mail
 - ⬆️(frontend) bump hono from 4.12.8 to 4.12.12 in /src/frontend
 - ⬆️(backend) bump pygments from 2.19.2 to 2.20.0 in /src/backend
+- ♻️(backend) use Authorization header for LiveKit token authentication 
+- 🥅(backend) refine Twirp error handling for participant operations
 
 ### Fixed
 
 - ⬆️(dependencies) update aiohttp to v3.13.4 [SECURITY]
 - ⬆️(dependencies) update vite to v7.3.2 [SECURITY]
 - ⬆️(dependencies) update django to v5.2.13 [SECURITY]
+- 🔒(backend) rely on backend to allow participant update their metadata
 
 ## [1.13.0] - 2026-03-31
 
diff --git a/src/backend/core/tests/rooms/test_api_rooms_participants_management.py b/src/backend/core/tests/rooms/test_api_rooms_participants_management.py
index c325c96a..f9d17024 100644
--- a/src/backend/core/tests/rooms/test_api_rooms_participants_management.py
+++ b/src/backend/core/tests/rooms/test_api_rooms_participants_management.py
@@ -91,7 +91,7 @@ def test_mute_participant_unexpected_twirp_error(mock_livekit_client):
     client = APIClient()
 
     mock_livekit_client.room.mute_published_track.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     room = RoomFactory()
@@ -387,7 +387,7 @@ def test_update_participant_unexpected_twirp_error(mock_livekit_client):
     client = APIClient()
 
     mock_livekit_client.room.update_participant.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     room = RoomFactory()
@@ -526,7 +526,7 @@ def test_remove_participant_unexpected_twirp_error(mock_livekit_client):
     client = APIClient()
 
     mock_livekit_client.room.remove_participant.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     room = RoomFactory()
diff --git a/src/backend/core/tests/rooms/test_api_rooms_subtitle.py b/src/backend/core/tests/rooms/test_api_rooms_subtitle.py
index 2a9fe216..6c4923d8 100644
--- a/src/backend/core/tests/rooms/test_api_rooms_subtitle.py
+++ b/src/backend/core/tests/rooms/test_api_rooms_subtitle.py
@@ -172,7 +172,7 @@ def test_start_subtitle_twirp_error(
     client = APIClient()
 
     mock_livekit_client.agent_dispatch.create_dispatch.side_effect = TwirpError(
-        msg="Internal server error", code=500, status=500
+        msg="Internal server error", code="unknown", status=500
     )
 
     response = client.post(
diff --git a/src/backend/core/tests/services/test_telephony_service.py b/src/backend/core/tests/services/test_telephony_service.py
index 96551252..c1b6a0aa 100644
--- a/src/backend/core/tests/services/test_telephony_service.py
+++ b/src/backend/core/tests/services/test_telephony_service.py
@@ -72,7 +72,7 @@ def test_create_dispatch_rule_api_failure(mock_client_factory):
 
     mock_api = create_mock_livekit_client()
     mock_api.sip.create_sip_dispatch_rule = mock.AsyncMock(
-        side_effect=TwirpError(msg="Internal server error", code=500, status=500)
+        side_effect=TwirpError(msg="Internal server error", code="unknown", status=500)
     )
     mock_client_factory.return_value = mock_api
 
@@ -177,7 +177,7 @@ def test_list_dispatch_rules_ids_api_failure(mock_client_factory):
 
     mock_api = create_mock_livekit_client()
     mock_api.sip.list_sip_dispatch_rule = mock.AsyncMock(
-        side_effect=TwirpError(msg="Internal server error", code=500, status=500)
+        side_effect=TwirpError(msg="Internal server error", code="unknown", status=500)
     )
     mock_client_factory.return_value = mock_api
 
@@ -270,7 +270,7 @@ def test_delete_dispatch_rule_partial_failure(mock_client_factory, mock_list_rul
         if call_count == 0:
             call_count += 1
             return None
-        raise TwirpError(msg="Deletion failed", code=500, status=500)
+        raise TwirpError(msg="Deletion failed", code="unknown", status=500)
 
     mock_api.sip.delete_sip_dispatch_rule = mock.AsyncMock(
         side_effect=delete_side_effect
@@ -294,7 +294,7 @@ def test_delete_dispatch_rule_api_failure(mock_client_factory, mock_list_rules):
     mock_list_rules.return_value = ["rule-1"]
     mock_api = create_mock_livekit_client()
     mock_api.sip.delete_sip_dispatch_rule = mock.AsyncMock(
-        side_effect=TwirpError(msg="Internal server error", code=500, status=500)
+        side_effect=TwirpError(msg="Internal server error", code="unknown", status=500)
     )
     mock_client_factory.return_value = mock_api