diff --git a/src/deltaglider/app/cli/main.py b/src/deltaglider/app/cli/main.py
index 7a688ec..e7acda5 100644
--- a/src/deltaglider/app/cli/main.py
+++ b/src/deltaglider/app/cli/main.py
@@ -263,7 +263,10 @@ def ls(
 
             client = DeltaGliderClient(service)
             dg_response = client.list_objects(
-                Bucket=bucket_name, Prefix=prefix_str, MaxKeys=10000, Delimiter="/" if not recursive else ""
+                Bucket=bucket_name,
+                Prefix=prefix_str,
+                MaxKeys=10000,
+                Delimiter="/" if not recursive else "",
             )
             objects = dg_response["Contents"]
 
@@ -275,7 +278,7 @@ def ls(
                     # Show only the directory name, not the full path
                     if prefix_str:
                         # Strip the current prefix to show only the subdirectory
-                        display_name = prefix_path[len(prefix_str):]
+                        display_name = prefix_path[len(prefix_str) :]
                     else:
                         display_name = prefix_path
                     click.echo(f"                           PRE {display_name}")
@@ -284,7 +287,7 @@ def ls(
                 filtered_objects = []
                 for obj in objects:
                     obj_key = obj["Key"]
-                    rel_path = obj_key[len(prefix_str):] if prefix_str else obj_key
+                    rel_path = obj_key[len(prefix_str) :] if prefix_str else obj_key
                     # Only include if it's a direct child (no / in relative path)
                     if "/" not in rel_path and rel_path:
                         filtered_objects.append(obj)
@@ -310,7 +313,7 @@ def ls(
 
                 # Show only the filename relative to current prefix (like AWS CLI)
                 if prefix_str:
-                    display_key = obj["Key"][len(prefix_str):]
+                    display_key = obj["Key"][len(prefix_str) :]
                 else:
                     display_key = obj["Key"]
 
diff --git a/src/deltaglider/client.py b/src/deltaglider/client.py
index 666147b..203a1d1 100644
--- a/src/deltaglider/client.py
+++ b/src/deltaglider/client.py
@@ -309,7 +309,9 @@ class DeltaGliderClient:
                         reference_key = metadata.get("ref_key")
 
                         deltaglider_metadata["deltaglider-original-size"] = str(original_size)
-                        deltaglider_metadata["deltaglider-compression-ratio"] = str(compression_ratio)
+                        deltaglider_metadata["deltaglider-compression-ratio"] = str(
+                            compression_ratio
+                        )
                         if reference_key:
                             deltaglider_metadata["deltaglider-reference-key"] = reference_key
                 except Exception as e:
@@ -1129,9 +1131,7 @@ class DeltaGliderClient:
                 compression_ratio_str = metadata.get("deltaglider-compression-ratio", "0.0")
                 try:
                     compression_ratio = (
-                        float(compression_ratio_str)
-                        if compression_ratio_str != "unknown"
-                        else 0.0
+                        float(compression_ratio_str) if compression_ratio_str != "unknown" else 0.0
                     )
                 except ValueError:
                     compression_ratio = 0.0
@@ -1143,7 +1143,9 @@ class DeltaGliderClient:
                         last_modified=obj_dict.get("LastModified", ""),
                         etag=obj_dict.get("ETag"),
                         storage_class=obj_dict.get("StorageClass", "STANDARD"),
-                        original_size=int(metadata.get("deltaglider-original-size", obj_dict["Size"])),
+                        original_size=int(
+                            metadata.get("deltaglider-original-size", obj_dict["Size"])
+                        ),
                         compressed_size=obj_dict["Size"],
                         is_delta=metadata.get("deltaglider-is-delta", "false") == "true",
                         compression_ratio=compression_ratio,
diff --git a/tests/integration/test_filtering_and_cleanup.py b/tests/integration/test_filtering_and_cleanup.py
index 38159cf..3295486 100644
--- a/tests/integration/test_filtering_and_cleanup.py
+++ b/tests/integration/test_filtering_and_cleanup.py
@@ -68,9 +68,7 @@ class TestSDKFiltering:
 
         # Verify is_delta flag is set correctly in Metadata
         delta_objects = [
-            obj
-            for obj in contents
-            if obj.get("Metadata", {}).get("deltaglider-is-delta") == "true"
+            obj for obj in contents if obj.get("Metadata", {}).get("deltaglider-is-delta") == "true"
         ]
         assert len(delta_objects) == 2