diff --git a/geneplexus/__init__.py b/geneplexus/__init__.py
index 718c88f..c0a5a0e 100644
--- a/geneplexus/__init__.py
+++ b/geneplexus/__init__.py
@@ -125,6 +125,7 @@
 analysis *cannot* be done due to the lack to pretrained models.
 
 """
+
 from ._config import config  # noreorder
 from . import download
 from . import util
diff --git a/geneplexus/_config/__init__.py b/geneplexus/_config/__init__.py
index eeb3ffe..add5578 100644
--- a/geneplexus/_config/__init__.py
+++ b/geneplexus/_config/__init__.py
@@ -1,4 +1,5 @@
 """Basic configurations."""
+
 from . import config
 from .logger_util import make_logger
 
diff --git a/geneplexus/_config/config.py b/geneplexus/_config/config.py
index 148d162..fc09245 100644
--- a/geneplexus/_config/config.py
+++ b/geneplexus/_config/config.py
@@ -1,4 +1,5 @@
 """Global variables used by the GenePlexus library."""
+
 import os.path as osp
 import pathlib
 from typing import Any
diff --git a/geneplexus/_config/logger_util.py b/geneplexus/_config/logger_util.py
index 8c5933f..074a080 100644
--- a/geneplexus/_config/logger_util.py
+++ b/geneplexus/_config/logger_util.py
@@ -1,4 +1,5 @@
 """Logger utilities."""
+
 import logging
 from contextlib import contextmanager
 from typing import Optional
diff --git a/geneplexus/cli.py b/geneplexus/cli.py
index 5dfab63..9f3bb2c 100644
--- a/geneplexus/cli.py
+++ b/geneplexus/cli.py
@@ -1,4 +1,5 @@
 """Command line interface for the GenePlexus pipeline."""
+
 import argparse
 import atexit
 import os
diff --git a/geneplexus/custom.py b/geneplexus/custom.py
index 57cc307..2c79499 100755
--- a/geneplexus/custom.py
+++ b/geneplexus/custom.py
@@ -1,4 +1,5 @@
 """Helper functions for setting up custom networks and GSCs."""
+
 import json
 import os.path as osp
 
diff --git a/geneplexus/download.py b/geneplexus/download.py
index 74cb6fc..1fec525 100755
--- a/geneplexus/download.py
+++ b/geneplexus/download.py
@@ -1,4 +1,5 @@
 """Data download module."""
+
 import io
 import os.path as osp
 import time
diff --git a/geneplexus/geneplexus.py b/geneplexus/geneplexus.py
index cea0dd1..e17081e 100755
--- a/geneplexus/geneplexus.py
+++ b/geneplexus/geneplexus.py
@@ -1,4 +1,5 @@
 """GenePlexus API."""
+
 import os
 import os.path as osp
 import warnings
diff --git a/geneplexus/util.py b/geneplexus/util.py
index d834303..45e0e5e 100755
--- a/geneplexus/util.py
+++ b/geneplexus/util.py
@@ -1,4 +1,5 @@
 """Utilities including file and path handling."""
+
 import functools
 import json
 import os