diff --git a/api/core/app/apps/advanced_chat/app_runner.py b/api/core/app/apps/advanced_chat/app_runner.py
index a440b35035..a2ae8dec5b 100644
--- a/api/core/app/apps/advanced_chat/app_runner.py
+++ b/api/core/app/apps/advanced_chat/app_runner.py
@@ -21,6 +21,7 @@ from core.app.entities.queue_entities import (
 )
 from core.app.features.annotation_reply.annotation_reply import AnnotationReplyFeature
 from core.app.layers.conversation_variable_persist_layer import ConversationVariablePersistenceLayer
+from core.db.session_factory import session_factory
 from core.moderation.base import ModerationError
 from core.moderation.input_moderation import InputModeration
 from core.variables.variables import VariableUnion
@@ -41,7 +42,7 @@ from models import Workflow
 from models.enums import UserFrom
 from models.model import App, Conversation, Message, MessageAnnotation
 from models.workflow import ConversationVariable
-from services.conversation_variable_updater import conversation_variable_updater_factory
+from services.conversation_variable_updater import ConversationVariableUpdater
 
 logger = logging.getLogger(__name__)
 
@@ -202,7 +203,9 @@ class AdvancedChatAppRunner(WorkflowBasedAppRunner):
         )
 
         workflow_entry.graph_engine.layer(persistence_layer)
-        conversation_variable_layer = ConversationVariablePersistenceLayer(conversation_variable_updater_factory())
+        conversation_variable_layer = ConversationVariablePersistenceLayer(
+            ConversationVariableUpdater(session_factory.get_session_maker())
+        )
         workflow_entry.graph_engine.layer(conversation_variable_layer)
         for layer in self._graph_engine_layers:
             workflow_entry.graph_engine.layer(layer)
diff --git a/api/services/conversation_service.py b/api/services/conversation_service.py
index 038c9feb12..295d48d8a1 100644
--- a/api/services/conversation_service.py
+++ b/api/services/conversation_service.py
@@ -17,7 +17,7 @@ from libs.datetime_utils import naive_utc_now
 from libs.infinite_scroll_pagination import InfiniteScrollPagination
 from models import Account, ConversationVariable
 from models.model import App, Conversation, EndUser, Message
-from services.conversation_variable_updater import conversation_variable_updater_factory
+from services.conversation_variable_updater import ConversationVariableUpdater
 from services.errors.conversation import (
     ConversationNotExistsError,
     ConversationVariableNotExistsError,
@@ -337,7 +337,7 @@ class ConversationService:
             updated_variable = variable_factory.build_conversation_variable_from_mapping(updated_variable_dict)
 
             # Use the conversation variable updater to persist the changes
-            updater = conversation_variable_updater_factory()
+            updater = ConversationVariableUpdater(session_factory.get_session_maker())
             updater.update(conversation_id, updated_variable)
             updater.flush()
 
diff --git a/api/services/conversation_variable_updater.py b/api/services/conversation_variable_updater.py
index 2da507fac7..acc0ec2b22 100644
--- a/api/services/conversation_variable_updater.py
+++ b/api/services/conversation_variable_updater.py
@@ -1,8 +1,7 @@
 from sqlalchemy import select
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, sessionmaker
 
 from core.variables.variables import Variable
-from extensions.ext_database import db
 from models import ConversationVariable
 
 
@@ -10,12 +9,15 @@ class ConversationVariableNotFoundError(Exception):
     pass
 
 
-class ConversationVariableUpdaterImpl:
+class ConversationVariableUpdater:
+    def __init__(self, session_maker: sessionmaker[Session]) -> None:
+        self._session_maker: sessionmaker[Session] = session_maker
+
     def update(self, conversation_id: str, variable: Variable) -> None:
         stmt = select(ConversationVariable).where(
             ConversationVariable.id == variable.id, ConversationVariable.conversation_id == conversation_id
         )
-        with Session(db.engine) as session:
+        with self._session_maker() as session:
             row = session.scalar(stmt)
             if not row:
                 raise ConversationVariableNotFoundError("conversation variable not found in the database")
@@ -24,7 +26,3 @@ class ConversationVariableUpdaterImpl:
 
     def flush(self) -> None:
         pass
-
-
-def conversation_variable_updater_factory() -> ConversationVariableUpdaterImpl:
-    return ConversationVariableUpdaterImpl()