diff --git a/src/npe2/manifest/_bases.py b/src/npe2/manifest/_bases.py
index 74af6b0f..d5e7d7c7 100644
--- a/src/npe2/manifest/_bases.py
+++ b/src/npe2/manifest/_bases.py
@@ -86,7 +86,7 @@ def from_file(cls, path: Union[Path, str]):
         else:
             raise ValueError(f"unrecognized file extension: {path}")  # pragma: no cover
 
-        with open(path, mode='rb') as f:
+        with open(path, mode="rb") as f:
             data = loader(f) or {}
 
         if path.name == "pyproject.toml":