diff --git a/csa_header/__init__.py b/csa_header/__init__.py
index ec9d558..0677a72 100644
--- a/csa_header/__init__.py
+++ b/csa_header/__init__.py
@@ -6,6 +6,7 @@
 <https://nipy.org/nibabel/dicom/siemens_csa.html#siemens-format-dicom-with-csa-header>`_
 `NiBabel <https://nipy.org/nibabel/index.html>`_ article.
 """
+
 from csa_header.header import CsaHeader
 
 __all__ = ["CsaHeader"]
diff --git a/csa_header/ascii/ascconv.py b/csa_header/ascii/ascconv.py
index 2b2aa19..e2ae9f7 100644
--- a/csa_header/ascii/ascconv.py
+++ b/csa_header/ascii/ascconv.py
@@ -37,6 +37,7 @@
 
 We deal with this by dropping any assignments containing ``__attribute__``.
 """
+
 from __future__ import annotations
 
 import ast
diff --git a/csa_header/ascii/header.py b/csa_header/ascii/header.py
index 1c01874..2c51372 100644
--- a/csa_header/ascii/header.py
+++ b/csa_header/ascii/header.py
@@ -1,6 +1,7 @@
 """
 Definition of the :class:`CsaAsciiHeader`.
 """
+
 from typing import Union
 
 from csa_header.ascii.ascconv import parse_ascconv
diff --git a/csa_header/ascii/messages.py b/csa_header/ascii/messages.py
index b1cc79c..64125d3 100644
--- a/csa_header/ascii/messages.py
+++ b/csa_header/ascii/messages.py
@@ -1,6 +1,7 @@
 """
 Messages for the :mod:`~csa_header.ascii` module.
 """
+
 AST_N_TARGETS: str = "Invalid number of AST assignment targets! Expected 1, got {n_targets}."
 BAD_ASCCONV_TYPE: str = "Atom {el} has type {maker}, but expecting type {expected_type}"
 UNEXPECTED_LHS: str = "Unexpected LHS element: {target}"
diff --git a/csa_header/header.py b/csa_header/header.py
index a44c120..ce77c45 100644
--- a/csa_header/header.py
+++ b/csa_header/header.py
@@ -1,4 +1,5 @@
 """Definition of the :class:`CsaHeader` class."""
+
 from collections.abc import Iterable
 from typing import Any
 
diff --git a/csa_header/messages.py b/csa_header/messages.py
index 3773213..499c162 100644
--- a/csa_header/messages.py
+++ b/csa_header/messages.py
@@ -1,6 +1,7 @@
 """
 Messages for the :mod:`csa_header` library.
 """
+
 INVALID_CHECK_BIT: str = (
     "CSA element #{i_tag} has an invalid check bit value: {check_bit}!\nValid values are {valid_values}"
 )
diff --git a/csa_header/unpacker.py b/csa_header/unpacker.py
index ee78dd8..27b1d9b 100644
--- a/csa_header/unpacker.py
+++ b/csa_header/unpacker.py
@@ -5,6 +5,7 @@
 ----------
 * https://github.com/nipy/nibabel/blob/4703f4d8e32be4cec30e829c2d93ebe54759bb62/nibabel/nicom/structreader.py
 """
+
 from __future__ import annotations
 
 from struct import Struct
diff --git a/csa_header/utils.py b/csa_header/utils.py
index 1ec745f..b661e0a 100644
--- a/csa_header/utils.py
+++ b/csa_header/utils.py
@@ -1,6 +1,7 @@
 """
 Utilities for the :mod:`csa_header` library.
 """
+
 # DICOM VR code to Python type
 VR_TO_TYPE = {
     "FL": float,  # float
diff --git a/tests/ascii/fixtures.py b/tests/ascii/fixtures.py
index 11efb5f..67174d2 100644
--- a/tests/ascii/fixtures.py
+++ b/tests/ascii/fixtures.py
@@ -1,4 +1,5 @@
 """Comparison values to test ascconv parsing."""
+
 from tests.fixtures import TEST_FILES_DIR
 
 RAW_ELEMENTS = """
diff --git a/tests/ascii/test_ascconv_sample.py b/tests/ascii/test_ascconv_sample.py
index bffba78..f7407b7 100644
--- a/tests/ascii/test_ascconv_sample.py
+++ b/tests/ascii/test_ascconv_sample.py
@@ -1,6 +1,7 @@
 """
 Tests for the the Siemens "ASCCONV" parser.
 """
+
 import ast
 from collections import OrderedDict
 
diff --git a/tests/fixtures.py b/tests/fixtures.py
index 315ef0d..0644e1e 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -1,4 +1,5 @@
 """Fixtures for tests."""
+
 from pathlib import Path
 
 TEST_FILES_DIR: Path = Path(__file__).parent / "files"