diff --git a/hb_server/apps/sam/models.py b/hb_server/apps/sam/models.py
index 2ae6459..1925c07 100644
--- a/hb_server/apps/sam/models.py
+++ b/hb_server/apps/sam/models.py
@@ -6,7 +6,6 @@ import django.utils.timezone as timezone
 from django.db.models.query import QuerySet
 
 from utils.model import SoftModel, BaseModel
-from simple_history.models import HistoricalRecords
 from apps.mtm.models import Material