diff --git a/CHANGELOG.md b/CHANGELOG.md
index fde5620..b054fad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- version list -->
 
+## [Unreleased]
+
+### Fixed
+- Replace deprecated Pydantic V2 `.dict()` calls with `.model_dump()` in `admin.py` and `notifications.py` endpoints.
+- Fix `RuntimeWarning: coroutine 'AsyncMockMixin._execute_mock_call' was never awaited` in `test_tasks.py` and `test_config_service.py` by marking `db.add` as a synchronous `MagicMock` in test helpers.
+
 ## v0.6.3 (2026-04-07)
 
 ### Bug Fixes
diff --git a/backend/app/api/v1/endpoints/admin.py b/backend/app/api/v1/endpoints/admin.py
index d91b377..24ff725 100644
--- a/backend/app/api/v1/endpoints/admin.py
+++ b/backend/app/api/v1/endpoints/admin.py
@@ -322,7 +322,7 @@ async def create_admin_notification_config(
     db: AsyncSession = Depends(get_db),
 ):
     """Create a new admin notification configuration (admin only)"""
-    config = AdminNotificationConfig(**config_in.dict())
+    config = AdminNotificationConfig(**config_in.model_dump())
     db.add(config)
     await db.commit()
     await db.refresh(config)
@@ -370,7 +370,7 @@ async def update_admin_notification_config(
             detail="Admin notification config not found",
         )
 
-    update_data = config_in.dict(exclude_unset=True)
+    update_data = config_in.model_dump(exclude_unset=True)
     for field, value in update_data.items():
         setattr(config, field, value)
 
diff --git a/backend/app/api/v1/endpoints/notifications.py b/backend/app/api/v1/endpoints/notifications.py
index 4706028..7640541 100644
--- a/backend/app/api/v1/endpoints/notifications.py
+++ b/backend/app/api/v1/endpoints/notifications.py
@@ -29,7 +29,7 @@ async def create_notification_config(
     db: AsyncSession = Depends(get_db),
 ):
     """Create a new notification configuration"""
-    config = NotificationConfig(user_id=current_user.id, **config_in.dict())
+    config = NotificationConfig(user_id=current_user.id, **config_in.model_dump())
     db.add(config)
     await db.commit()
     await db.refresh(config)
@@ -91,7 +91,7 @@ async def update_notification_config(
             detail="Notification config not found",
         )
 
-    update_data = config_in.dict(exclude_unset=True)
+    update_data = config_in.model_dump(exclude_unset=True)
     for field, value in update_data.items():
         setattr(config, field, value)
 
diff --git a/backend/tests/unit/test_config_service.py b/backend/tests/unit/test_config_service.py
index 8532ede..06f2749 100644
--- a/backend/tests/unit/test_config_service.py
+++ b/backend/tests/unit/test_config_service.py
@@ -172,9 +172,8 @@ class TestConfigServiceSet:
         mock_result.scalar_one_or_none.return_value = None
 
         mock_db = AsyncMock()
+        mock_db.add = MagicMock()
         mock_db.execute.return_value = mock_result
-
-        # The method will call db.add() and db.commit()
         await ConfigService.set(
             "SMTP_HOST", "new.host.com", db=mock_db, category="smtp"
         )
diff --git a/backend/tests/unit/test_tasks.py b/backend/tests/unit/test_tasks.py
index 56bea67..b1e818a 100644
--- a/backend/tests/unit/test_tasks.py
+++ b/backend/tests/unit/test_tasks.py
@@ -77,6 +77,8 @@ def _mock_session_maker():
     is usable as ``async with session_maker_mock() as db:``.
     """
     session = AsyncMock()
+    # db.add() is synchronous in SQLAlchemy; prevent "coroutine never awaited" warnings
+    session.add = MagicMock()
 
     # Make the session usable as an async context manager
     ctx = AsyncMock()
diff --git a/docs/TODO.md b/docs/TODO.md
index bb89f42..d437241 100644
--- a/docs/TODO.md
+++ b/docs/TODO.md
@@ -4,6 +4,8 @@ Comprehensive task breakdown for repository improvements and production readines
 
 ## ✅ Recently Completed
 
+- [x] **Fix Pydantic V2 deprecation warnings**: Replaced `.dict()` with `.model_dump()` in `admin.py` and `notifications.py`. Fixed `RuntimeWarning: coroutine never awaited` for `db.add()` in test mocks (`test_tasks.py`, `test_config_service.py`).
+
 - [x] **Expanded backend test coverage**: Added 150 new unit tests across 10 new test files, increasing the backend test count from 361 to 511. New coverage includes `core/gdpr.py`, `utils/gmail_labels.py`, `services/notification_service.py`, `services/auth_service.py`, and API endpoints for auth, users, notifications, processing-runs/logs, app-settings, and version.
 
 - [x] **Improved test coverage for `mail_processor.py`**: Added 46 new unit tests covering POP3 connection testing, POP3 email fetching, IMAP edge cases, email forwarding (STARTTLS/SSL), and `fetch_emails`/`test_connection` routing. Coverage increased from ~42% to 98%.