diff --git a/jupyter_cache/cache/db.py b/jupyter_cache/cache/db.py
index 7e4cabd..a6f44f6 100644
--- a/jupyter_cache/cache/db.py
+++ b/jupyter_cache/cache/db.py
@@ -54,7 +54,7 @@ def get_version(path: Union[str, Path]) -> Optional[str]:
 
 def datetime_utcnow():
     if sys.version_info.minor >= 11:
-        return lambda : datetime.datetime.now(datetime.UTC)
+        return lambda: datetime.datetime.now(datetime.UTC)
     return datetime.datetime.utcnow