diff --git a/datastore/additional_data/management/commands/rewrite_additional_data.py b/datastore/additional_data/management/commands/rewrite_additional_data.py
index 1dfd65e9..2f01fed5 100644
--- a/datastore/additional_data/management/commands/rewrite_additional_data.py
+++ b/datastore/additional_data/management/commands/rewrite_additional_data.py
@@ -29,4 +29,5 @@ def handle(self, *args, **options):
         for grant in grants:
             additional_data = generator.create(grant.data)
             grant.additional_data = additional_data
-            grant.save()
+
+        Grant.objects.bulk_update(grants, ["additional_data"], batch_size=10000)