diff --git a/bootstrap/bootstrap.py b/bootstrap/bootstrap.py
index ac52039..f69aceb 100644
--- a/bootstrap/bootstrap.py
+++ b/bootstrap/bootstrap.py
@@ -42,6 +42,7 @@ Command line flags, from "bootstrap.py --help":
                             can also pass a branch name such as 'main' or a
                             commit hash.
 """
+
 import logging
 import multiprocessing
 import os
diff --git a/integration-tests/plugins/simplest/tljh_simplest.py b/integration-tests/plugins/simplest/tljh_simplest.py
index 015b504..ff433f8 100644
--- a/integration-tests/plugins/simplest/tljh_simplest.py
+++ b/integration-tests/plugins/simplest/tljh_simplest.py
@@ -1,6 +1,7 @@
 """
 Simplest plugin that exercises all the hooks defined in tljh/hooks.py.
 """
+
 from tljh.hooks import hookimpl
 
 
diff --git a/integration-tests/test_bootstrap.py b/integration-tests/test_bootstrap.py
index 09ae140..eac9c92 100644
--- a/integration-tests/test_bootstrap.py
+++ b/integration-tests/test_bootstrap.py
@@ -9,6 +9,7 @@ FIXME: The last test stands out and could be part of the other tests, and the
        first two could be more like unit tests. Ideally, this file is
        significantly reduced.
 """
+
 import concurrent.futures
 import os
 import subprocess
diff --git a/integration-tests/test_proxy.py b/integration-tests/test_proxy.py
index cc9d766..e1d376c 100644
--- a/integration-tests/test_proxy.py
+++ b/integration-tests/test_proxy.py
@@ -1,4 +1,5 @@
 """tests for the proxy"""
+
 import os
 import shutil
 import ssl
diff --git a/integration-tests/test_simplest_plugin.py b/integration-tests/test_simplest_plugin.py
index 96eb0a5..9c2337b 100644
--- a/integration-tests/test_simplest_plugin.py
+++ b/integration-tests/test_simplest_plugin.py
@@ -2,6 +2,7 @@
 Test the plugin in integration-tests/plugins/simplest that makes use of all tljh
 recognized plugin hooks that are defined in tljh/hooks.py.
 """
+
 import os
 import subprocess
 
diff --git a/tests/conftest.py b/tests/conftest.py
index cf765b9..106d534 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,5 @@
 """pytest fixtures"""
+
 import os
 import types
 from importlib import reload
diff --git a/tests/test_conda.py b/tests/test_conda.py
index 6d44595..397499e 100644
--- a/tests/test_conda.py
+++ b/tests/test_conda.py
@@ -1,6 +1,7 @@
 """
 Test conda commandline wrappers
 """
+
 import os
 import subprocess
 import tempfile
diff --git a/tests/test_installer.py b/tests/test_installer.py
index 07081e4..f06bb6e 100644
--- a/tests/test_installer.py
+++ b/tests/test_installer.py
@@ -1,6 +1,7 @@
 """
 Unit test  functions in installer.py
 """
+
 import json
 import os
 from subprocess import PIPE, run
diff --git a/tests/test_migrator.py b/tests/test_migrator.py
index 87275f6..91821a8 100644
--- a/tests/test_migrator.py
+++ b/tests/test_migrator.py
@@ -1,6 +1,7 @@
 """
 Unit test  functions in installer.py
 """
+
 import os
 from datetime import date
 
diff --git a/tests/test_normalize.py b/tests/test_normalize.py
index fe7c623..d408c3f 100644
--- a/tests/test_normalize.py
+++ b/tests/test_normalize.py
@@ -1,6 +1,7 @@
 """
 Test functions for normalizing various kinds of values
 """
+
 from tljh.normalize import generate_system_username
 
 
diff --git a/tests/test_traefik.py b/tests/test_traefik.py
index f950266..9b0c8f8 100644
--- a/tests/test_traefik.py
+++ b/tests/test_traefik.py
@@ -1,4 +1,5 @@
 """Test traefik configuration"""
+
 import os
 
 import pytest
diff --git a/tests/test_user.py b/tests/test_user.py
index 5bda68d..148e174 100644
--- a/tests/test_user.py
+++ b/tests/test_user.py
@@ -1,6 +1,7 @@
 """
 Test wrappers in tljw.user module
 """
+
 import grp
 import os
 import os.path
diff --git a/tljh/apt.py b/tljh/apt.py
index b5b0845..d746f45 100644
--- a/tljh/apt.py
+++ b/tljh/apt.py
@@ -1,6 +1,7 @@
 """
 Utilities for working with the apt package manager
 """
+
 import os
 import subprocess
 
diff --git a/tljh/conda.py b/tljh/conda.py
index a543645..49737c4 100644
--- a/tljh/conda.py
+++ b/tljh/conda.py
@@ -1,6 +1,7 @@
 """
 Wrap conda commandline program
 """
+
 import contextlib
 import hashlib
 import json
diff --git a/tljh/hooks.py b/tljh/hooks.py
index ddaa2a3..8bdaf79 100644
--- a/tljh/hooks.py
+++ b/tljh/hooks.py
@@ -1,6 +1,7 @@
 """
 Hook specifications that pluggy plugins can override
 """
+
 import pluggy
 
 hookspec = pluggy.HookspecMarker("tljh")
diff --git a/tljh/log.py b/tljh/log.py
index ed7eca4..7a0d5e7 100644
--- a/tljh/log.py
+++ b/tljh/log.py
@@ -1,4 +1,5 @@
 """Setup tljh logging"""
+
 import logging
 import os
 
diff --git a/tljh/normalize.py b/tljh/normalize.py
index 01d1777..4f4c9e1 100644
--- a/tljh/normalize.py
+++ b/tljh/normalize.py
@@ -1,6 +1,7 @@
 """
 Functions to normalize various inputs
 """
+
 import hashlib
 
 
diff --git a/tljh/systemd.py b/tljh/systemd.py
index f274fab..6bfaf1b 100644
--- a/tljh/systemd.py
+++ b/tljh/systemd.py
@@ -3,6 +3,7 @@ Wraps systemctl to install, uninstall, start & stop systemd services.
 
 If we use a debian package instead, we can get rid of all this code.
 """
+
 import os
 import subprocess
 
diff --git a/tljh/traefik.py b/tljh/traefik.py
index 4ea0d49..a19a3de 100644
--- a/tljh/traefik.py
+++ b/tljh/traefik.py
@@ -1,4 +1,5 @@
 """Traefik installation and setup"""
+
 import hashlib
 import io
 import logging
diff --git a/tljh/user.py b/tljh/user.py
index f5ed4ca..b03903f 100644
--- a/tljh/user.py
+++ b/tljh/user.py
@@ -3,6 +3,7 @@ User management for tljh.
 
 Supports minimal user & group management
 """
+
 import grp
 import pwd
 import subprocess
diff --git a/tljh/utils.py b/tljh/utils.py
index 8ab1ca8..fceec70 100644
--- a/tljh/utils.py
+++ b/tljh/utils.py
@@ -1,6 +1,7 @@
 """
 Miscellaneous functions useful in at least two places unrelated to each other
 """
+
 import logging
 import re
 import subprocess
diff --git a/tljh/yaml.py b/tljh/yaml.py
index e51381e..daff06b 100644
--- a/tljh/yaml.py
+++ b/tljh/yaml.py
@@ -3,6 +3,7 @@
 ensures the same yaml settings for reading/writing
 throughout tljh
 """
+
 from ruamel.yaml import YAML
 from ruamel.yaml.composer import Composer