diff --git a/backend/alembic/versions/027_modify_permission.py b/backend/alembic/versions/027_modify_permission.py
new file mode 100644
index 0000000..bd6b767
--- /dev/null
+++ b/backend/alembic/versions/027_modify_permission.py
@@ -0,0 +1,35 @@
+"""027_modify_permission
+
+Revision ID: b049c9f8ca5b
+Revises: 4c6d18a18bd4
+Create Date: 2025-07-16 09:59:23.345135
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'b049c9f8ca5b'
+down_revision = '4c6d18a18bd4'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('ds_permission', sa.Column('name', sqlmodel.sql.sqltypes.AutoString(length=128), nullable=True))
+    op.alter_column('ds_permission', 'auth_target_type',
+               existing_type=sa.VARCHAR(length=128),
+               nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('ds_permission', 'auth_target_type',
+               existing_type=sa.VARCHAR(length=128),
+               nullable=False)
+    op.drop_column('ds_permission', 'name')
+    # ### end Alembic commands ###