diff --git a/nmdc_server/migrations/versions/2ec2d0b4f840_create_data_object_id_idx.py b/nmdc_server/migrations/versions/2ec2d0b4f840_create_data_object_id_idx.py
index 87024280..ed6fb698 100644
--- a/nmdc_server/migrations/versions/2ec2d0b4f840_create_data_object_id_idx.py
+++ b/nmdc_server/migrations/versions/2ec2d0b4f840_create_data_object_id_idx.py
@@ -8,7 +8,6 @@
 
 from typing import Optional
 
-import sqlalchemy as sa
 from alembic import op
 
 # revision identifiers, used by Alembic.