diff --git a/shub/deploy.py b/shub/deploy.py
index cdafabc5..0e2d0797 100644
--- a/shub/deploy.py
+++ b/shub/deploy.py
@@ -193,7 +193,9 @@ def _get_pipfile_requirements(tmpdir=None):
     return open(_add_sources(convert_deps_to_pip(deps), _sources=sources.encode(), tmpdir=tmpdir), 'rb')
 
 
-def _add_sources(_requirements: Union[str, list], _sources: bytes, tmpdir: Optional[AnyStr] = None) -> str:
+def _add_sources(
+    _requirements: Union[str, list], _sources: bytes, tmpdir: Optional[AnyStr] = None
+) -> str:
     tmp = tempfile.NamedTemporaryFile(delete=False, suffix="-requirements.txt", dir=tmpdir)
     tmp.write(_sources + b'\n')
     # Keep backward compatibility with pipenv<=2022.8.30