diff --git a/pysamplelib/__init__.py b/pysamplelib/__init__.py
index 0870219..af13aae 100644
--- a/pysamplelib/__init__.py
+++ b/pysamplelib/__init__.py
@@ -1,4 +1,5 @@
 """Top-level package of `pysamplelib`."""
+
 from __future__ import annotations
 
 from .__version__ import __version__
diff --git a/pysamplelib/__version__.py b/pysamplelib/__version__.py
index d1c3df0..4637f33 100644
--- a/pysamplelib/__version__.py
+++ b/pysamplelib/__version__.py
@@ -2,6 +2,7 @@
 
 This package uses Semantic Versioning, see: https://semver.org.
 """
+
 from __future__ import annotations
 
 MAJOR = 0
diff --git a/pysamplelib/fizzbuzz.py b/pysamplelib/fizzbuzz.py
index 79218b5..b635c67 100644
--- a/pysamplelib/fizzbuzz.py
+++ b/pysamplelib/fizzbuzz.py
@@ -1,4 +1,5 @@
 """FizzBuzz implementation."""
+
 from __future__ import annotations
 
 import collections