diff --git a/aiida_dataframe/cli.py b/aiida_dataframe/cli.py
index e73b044..10277ec 100644
--- a/aiida_dataframe/cli.py
+++ b/aiida_dataframe/cli.py
@@ -5,6 +5,7 @@
 directly into the 'verdi' command by using AiiDA-specific entry points like
 "aiida.cmdline.data" (both in the pyproject.toml file).
 """
+
 import sys
 import tempfile
 
diff --git a/aiida_dataframe/data/__init__.py b/aiida_dataframe/data/__init__.py
index 9060437..b758256 100644
--- a/aiida_dataframe/data/__init__.py
+++ b/aiida_dataframe/data/__init__.py
@@ -3,6 +3,7 @@
 
 Register data types via the "aiida.data" entry point in pyproject.toml.
 """
+
 from .dataframe import PandasFrameData
 
 __all__ = ("PandasFrameData",)
diff --git a/aiida_dataframe/data/dataframe.py b/aiida_dataframe/data/dataframe.py
index e4409d9..97fc5d5 100644
--- a/aiida_dataframe/data/dataframe.py
+++ b/aiida_dataframe/data/dataframe.py
@@ -2,6 +2,7 @@
 This module defines a AiiDA Data plugin for pandas DataFrames to be
 stored in the file repository as HDF5 files
 """
+
 from __future__ import annotations
 
 import hashlib
diff --git a/conftest.py b/conftest.py
index 25a081b..b1e7701 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,4 +1,5 @@
 """pytest fixtures for simplified testing."""
+
 import pytest
 
 pytest_plugins = ["aiida.manage.tests.pytest_fixtures", "pytest_regressions"]
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 1c56e9d..320c0df 100755
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -222,9 +222,9 @@ def run_apidoc(_):
 
     # See https://stackoverflow.com/a/30144019
     env = os.environ.copy()
-    env[
-        "SPHINX_APIDOC_OPTIONS"
-    ] = "members,special-members,private-members,undoc-members,show-inheritance"
+    env["SPHINX_APIDOC_OPTIONS"] = (
+        "members,special-members,private-members,undoc-members,show-inheritance"
+    )
     subprocess.check_call([cmd_path] + options, env=env)
 
 
diff --git a/tests/__init__.py b/tests/__init__.py
index 94cbb42..484b467 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,8 +1,9 @@
-""" Tests for the plugin.
+"""Tests for the plugin.
 
 Includes both tests written in unittest style (test_cli.py) and tests written
 in pytest style (test_calculations.py).
 """
+
 import os
 
 TEST_DIR = os.path.dirname(os.path.realpath(__file__))
diff --git a/tests/test_cli.py b/tests/test_cli.py
index f75f043..278c6ae 100644
--- a/tests/test_cli.py
+++ b/tests/test_cli.py
@@ -1,4 +1,5 @@
-""" Tests for command line interface."""
+"""Tests for command line interface."""
+
 from click.testing import CliRunner
 import numpy as np
 import pandas as pd
diff --git a/tests/test_data.py b/tests/test_data.py
index 1d9209c..bc58ea1 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -1,4 +1,4 @@
-""" Tests for Data plugin."""
+"""Tests for Data plugin."""
 
 import numpy as np
 import pandas as pd