diff --git a/apps/rpm/serializers.py b/apps/rpm/serializers.py
index 195b5554..9c3f9add 100644
--- a/apps/rpm/serializers.py
+++ b/apps/rpm/serializers.py
@@ -82,8 +82,8 @@ class RfileListSerializer(CustomModelSerializer):
 
 
 class RpjCreateUpdateSerializer(CustomModelSerializer):
-    rparty = serializers.PrimaryKeyRelatedField(queryset=Rparty.objects.all(), required=False, allow_blank=True)
-    belong_dept = serializers.PrimaryKeyRelatedField(queryset=Dept.objects.all(), required=False, allow_blank=True)
+    rparty = serializers.PrimaryKeyRelatedField(queryset=Rparty.objects.all(), required=False, allow_null=True)
+    belong_dept = serializers.PrimaryKeyRelatedField(queryset=Dept.objects.all(), required=False, allow_null=True)
 
     class Meta:
         model = Rpj