diff --git a/docs/conf.py b/docs/conf.py
index 586ced8..06241a6 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,4 +1,5 @@
 """Configuration file for the Sphinx documentation builder."""
+
 # For the full list of built-in configuration values, see the documentation:
 # https://www.sphinx-doc.org/en/master/usage/configuration.html
 import sphinx_rtd_theme
diff --git a/rctab_cli/__init__.py b/rctab_cli/__init__.py
index 325106c..0bf33b0 100644
--- a/rctab_cli/__init__.py
+++ b/rctab_cli/__init__.py
@@ -1,4 +1,5 @@
 """RCTab CLI package."""
+
 from rctab_cli.cli import acquire_access_token, app
 
 __all__ = ["app", "acquire_access_token"]
diff --git a/rctab_cli/auth.py b/rctab_cli/auth.py
index b923164..ead45c8 100644
--- a/rctab_cli/auth.py
+++ b/rctab_cli/auth.py
@@ -1,4 +1,5 @@
 """Authentication helpers for the RCTab CLI."""
+
 import atexit
 import logging
 from pathlib import Path
diff --git a/rctab_cli/config.py b/rctab_cli/config.py
index 949e9d0..85d7501 100644
--- a/rctab_cli/config.py
+++ b/rctab_cli/config.py
@@ -3,6 +3,7 @@
 Attributes:
     APP_NAME: Name of the CLI application.
 """
+
 from functools import lru_cache
 from uuid import UUID
 
diff --git a/rctab_cli/state.py b/rctab_cli/state.py
index 73c2672..42f2f35 100644
--- a/rctab_cli/state.py
+++ b/rctab_cli/state.py
@@ -1,4 +1,5 @@
 """State module."""
+
 from dataclasses import dataclass
 from typing import Callable, Dict, Optional
 
diff --git a/rctab_cli/sub_apps/__init__.py b/rctab_cli/sub_apps/__init__.py
index ab80fb9..cac47df 100644
--- a/rctab_cli/sub_apps/__init__.py
+++ b/rctab_cli/sub_apps/__init__.py
@@ -1,4 +1,5 @@
 """Subscription management app."""
+
 from rctab_cli.sub_apps.sub import subscription_app
 
 __all__ = ["subscription_app"]
diff --git a/rctab_cli/sub_apps/sub.py b/rctab_cli/sub_apps/sub.py
index 03f35b1..76debbd 100644
--- a/rctab_cli/sub_apps/sub.py
+++ b/rctab_cli/sub_apps/sub.py
@@ -4,6 +4,7 @@
     subscription_app: Typer object for the subscription CLI.
     finance_app: Typer object for the finance CLI.
 """
+
 # pylint: disable=too-many-arguments, redefined-outer-name
 import calendar
 import json
diff --git a/rctab_cli/types.py b/rctab_cli/types.py
index 0656f1f..ab531a6 100644
--- a/rctab_cli/types.py
+++ b/rctab_cli/types.py
@@ -1,4 +1,5 @@
 """Types for the RCTab CLI."""
+
 from pydantic import AnyHttpUrl, BaseModel
 
 
diff --git a/rctab_cli/utils.py b/rctab_cli/utils.py
index 282eb73..7bd6c69 100644
--- a/rctab_cli/utils.py
+++ b/rctab_cli/utils.py
@@ -1,4 +1,5 @@
 """Utility functions for the CLI."""
+
 import typer
 
 from rctab_cli.config import get_cli_settings
diff --git a/tests/utils.py b/tests/utils.py
index 04ccd51..d723f7b 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -1,4 +1,5 @@
 """Utilities for testing."""
+
 from click.testing import Result