diff --git a/src/backend/base/langflow/api/v1/monitor.py b/src/backend/base/langflow/api/v1/monitor.py
index a5daa61e5..c5b4e48f4 100644
--- a/src/backend/base/langflow/api/v1/monitor.py
+++ b/src/backend/base/langflow/api/v1/monitor.py
@@ -107,6 +107,39 @@ async def update_message(
         raise HTTPException(status_code=500, detail=str(e))
 
 
+@router.patch("/messages/session/{old_session_id}", response_model=list[MessageResponse])
+async def update_session_id(
+    old_session_id: str,
+    new_session_id: str = Query(..., description="The new session ID to update to"),
+    session: Session = Depends(get_session),
+    current_user: User = Depends(get_current_active_user),
+):
+    try:
+        # Get all messages with the old session ID
+        stmt = select(MessageTable).where(MessageTable.session_id == old_session_id)
+        messages = session.exec(stmt).all()
+
+        if not messages:
+            raise HTTPException(status_code=404, detail="No messages found with the given session ID")
+
+        # Update all messages with the new session ID
+        for message in messages:
+            message.session_id = new_session_id
+
+        session.add_all(messages)
+
+        session.commit()
+        message_responses = []
+        for message in messages:
+            session.refresh(message)
+            message_responses.append(MessageResponse.model_validate(message, from_attributes=True))
+        return message_responses
+    except HTTPException as e:
+        raise e
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=str(e))
+
+
 @router.delete("/messages/session/{session_id}", status_code=204)
 async def delete_messages_session(
     session_id: str,
diff --git a/src/backend/tests/unit/test_messages_endpoints.py b/src/backend/tests/unit/test_messages_endpoints.py
index ee4021784..74d9badc1 100644
--- a/src/backend/tests/unit/test_messages_endpoints.py
+++ b/src/backend/tests/unit/test_messages_endpoints.py
@@ -74,3 +74,40 @@ def test_delete_messages_session(client: TestClient, created_messages, logged_in
     response = client.get("api/v1/monitor/messages", headers=logged_in_headers)
     assert response.status_code == 200
     assert len(response.json()) == 0
+
+
+# Successfully update session ID for all messages with the old session ID
+def test_successfully_update_session_id(client, session, logged_in_headers, created_messages):
+    old_session_id = "session_id2"
+    new_session_id = "new_session_id"
+
+    response = client.patch(
+        f"api/v1/monitor/messages/session/{old_session_id}",
+        params={"new_session_id": new_session_id},
+        headers=logged_in_headers,
+    )
+
+    assert response.status_code == 200, response.text
+    updated_messages = response.json()
+    assert len(updated_messages) == len(created_messages)
+    for message in updated_messages:
+        assert message["session_id"] == new_session_id
+
+    response = client.get("api/v1/monitor/messages", headers=logged_in_headers, params={"session_id": new_session_id})
+    assert response.status_code == 200
+    assert len(response.json()) == len(created_messages)
+    for message in response.json():
+        assert message["session_id"] == new_session_id
+
+
+# No messages found with the given session ID
+def test_no_messages_found_with_given_session_id(client, session, logged_in_headers):
+    old_session_id = "non_existent_session_id"
+    new_session_id = "new_session_id"
+
+    response = client.patch(
+        f"/messages/session/{old_session_id}", params={"new_session_id": new_session_id}, headers=logged_in_headers
+    )
+
+    assert response.status_code == 404, response.text
+    assert response.json()["detail"] == "Not Found"