diff --git a/conda-store-server/conda_store_server/_internal/orm.py b/conda-store-server/conda_store_server/_internal/orm.py
index 468c8cbff..b3eb0879e 100644
--- a/conda-store-server/conda_store_server/_internal/orm.py
+++ b/conda-store-server/conda_store_server/_internal/orm.py
@@ -40,8 +40,8 @@
 )
 
 from conda_store_server._internal import conda_utils, schema, utils
-from conda_store_server.exception import BuildPathError
 from conda_store_server._internal.environment import validate_environment
+from conda_store_server.exception import BuildPathError
 
 logger = logging.getLogger("orm")
 
diff --git a/conda-store-server/conda_store_server/_internal/server/views/api.py b/conda-store-server/conda_store_server/_internal/server/views/api.py
index fec460cc8..b33c90ffd 100644
--- a/conda-store-server/conda_store_server/_internal/server/views/api.py
+++ b/conda-store-server/conda_store_server/_internal/server/views/api.py
@@ -12,12 +12,12 @@
 from fastapi.responses import JSONResponse, PlainTextResponse, RedirectResponse
 
 from conda_store_server import __version__, api, app
-from conda_store_server._internal import orm, schema, utils
+from conda_store_server._internal import orm, schema
 from conda_store_server._internal.environment import filter_environments
 from conda_store_server._internal.schema import AuthenticationToken, Permissions
 from conda_store_server._internal.server import dependencies
-from conda_store_server.server.auth import Authentication
 from conda_store_server.exception import CondaStoreError
+from conda_store_server.server.auth import Authentication
 
 
 class PaginatedArgs(TypedDict):
diff --git a/conda-store-server/conda_store_server/app.py b/conda-store-server/conda_store_server/app.py
index bb8af8c0e..fae95667d 100644
--- a/conda-store-server/conda_store_server/app.py
+++ b/conda-store-server/conda_store_server/app.py
@@ -26,8 +26,8 @@
 from traitlets.config import LoggingConfigurable
 
 from conda_store_server import CONDA_STORE_DIR, BuildKey, api, storage
-from conda_store_server.exception import CondaStoreError
 from conda_store_server._internal import conda_utils, environment, orm, schema, utils
+from conda_store_server.exception import CondaStoreError
 from conda_store_server.plugins import hookspec, plugin_manager
 from conda_store_server.plugins.types import lock
 
@@ -857,9 +857,7 @@ def delete_build(self, db: Session, build_id: int):
             schema.BuildStatus.FAILED,
             schema.BuildStatus.COMPLETED,
         ]:
-            raise CondaStoreError(
-                "cannot delete build since not finished building"
-            )
+            raise CondaStoreError("cannot delete build since not finished building")
 
         build.deleted_on = datetime.datetime.utcnow()
         db.commit()
diff --git a/conda-store-server/conda_store_server/exception.py b/conda-store-server/conda_store_server/exception.py
index 50db307ad..9f160dcac 100644
--- a/conda-store-server/conda_store_server/exception.py
+++ b/conda-store-server/conda_store_server/exception.py
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
+
 class CondaStoreError(Exception):
     @property
     def message(self):