diff --git a/app/repositories/project.py b/app/repositories/project.py
index 35ca6f3..6b12168 100644
--- a/app/repositories/project.py
+++ b/app/repositories/project.py
@@ -1,9 +1,9 @@
+import datetime
 import json
 import uuid
 from uuid import UUID
 
 import requests
-from dateutil.relativedelta import relativedelta
 from fastapi import HTTPException
 
 from app.config import TaskEnv
@@ -64,9 +64,12 @@ class ProjectRepository(BaseRepository[ProjectModel]):
             coding.has_monitor = True
             await self.create_report_price(coding)
             if coding.monitor.detail.date_create_project and coding.monitor.detail.first_time:
-                date_create = coding.monitor.detail.date_create_project
-                months = int(coding.monitor.detail.first_time)
-                coding.date_delay = date_create + relativedelta(months=months)
+                start_date = coding.monitor.detail.date_create_project
+                first_time_months = int(coding.monitor.detail.first_time)
+                new_month = start_date.month + first_time_months
+                new_year = start_date.year + (new_month - 1) // 12
+                new_month = (new_month - 1) % 12 + 1
+                coding.date_delay = start_date.replace(year=new_year, month=new_month)
         else:
             coding.has_monitor = False