diff --git a/tests/y_2015/test_2015_day4.py b/tests/y_2015/test_2015_day4.py
index ff8bcf6..cfcef75 100644
--- a/tests/y_2015/test_2015_day4.py
+++ b/tests/y_2015/test_2015_day4.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from unittest.mock import mock_open, patch, MagicMock
+from unittest.mock import MagicMock, mock_open, patch
 
 from y_2015.day4 import Day
 
diff --git a/y_2015/day4.py b/y_2015/day4.py
index 41a28b5..9db94d5 100644
--- a/y_2015/day4.py
+++ b/y_2015/day4.py
@@ -1,4 +1,5 @@
 import hashlib
+
 from common.aoc import AoCDay