diff --git a/src/uproot_browser/__init__.py b/src/uproot_browser/__init__.py
index f325edc..1770b5c 100644
--- a/src/uproot_browser/__init__.py
+++ b/src/uproot_browser/__init__.py
@@ -2,6 +2,7 @@
 This is uproot-browser. There is no user accessible API; only a terminal
 interface is provided currently.
 """
+
 from __future__ import annotations
 
 from ._version import version as __version__
diff --git a/src/uproot_browser/dirs.py b/src/uproot_browser/dirs.py
index 14cb4f4..7b2559e 100644
--- a/src/uproot_browser/dirs.py
+++ b/src/uproot_browser/dirs.py
@@ -2,6 +2,7 @@
 This holds common functions for accessing a file, ROOT directories, and trees
 split by colons.
 """
+
 from __future__ import annotations
 
 from typing import Any, Iterable
diff --git a/src/uproot_browser/exceptions.py b/src/uproot_browser/exceptions.py
index 153fd21..c07b078 100644
--- a/src/uproot_browser/exceptions.py
+++ b/src/uproot_browser/exceptions.py
@@ -1,6 +1,5 @@
 """Custom exceptions for uproot-browser"""
 
-
 from __future__ import annotations