diff --git a/.github/workflows/automated-tests.yaml b/.github/workflows/automated-tests.yaml
index 90f8ce6..257a56c 100644
--- a/.github/workflows/automated-tests.yaml
+++ b/.github/workflows/automated-tests.yaml
@@ -13,7 +13,7 @@ jobs:
       - run: apk add git
       - run: sh bin/ci/check_versions.sh
       - run: uv run isort --check homely test
-      - run: uv run pytest test
+      - run: uv run pytest -W error test
   Mypy:
     runs-on: ubuntu-latest
     # only run on oldest supported python version
diff --git a/homely/_test/system.py b/homely/_test/system.py
index 7e5a116..70737d9 100644
--- a/homely/_test/system.py
+++ b/homely/_test/system.py
@@ -123,7 +123,8 @@ def system(cmd, cwd=None, expecterror=False, tmpdir=None):
             print(open(stdoutpath).read())
             raise
 
-        return open(stdoutpath, 'r').read()
+        with open(stdoutpath, 'r') as f:
+            return f.read()
 
     return system
 
diff --git a/homely/_utils.py b/homely/_utils.py
index e4c420f..00ff1c8 100644
--- a/homely/_utils.py
+++ b/homely/_utils.py
@@ -1,13 +1,14 @@
 import contextlib
+import importlib.util
 import json
 import os
 import re
 import shutil
 import subprocess
+import sys
 import tempfile
 from datetime import timedelta
 from functools import partial
-from importlib.machinery import SourceFileLoader
 from itertools import chain
 from os.path import exists, join
 from typing import Any, Optional, Union
@@ -17,8 +18,28 @@
 from homely._vcs import Repo, fromdict
 
 
-def _loadmodule(name, path):
-    return SourceFileLoader(name, path).load_module()
+def _loadmodule(name: str, file_path: str):
+    spec = importlib.util.spec_from_file_location(name, file_path)
+    if spec is None:
+        raise ImportError(f"Cannot find module spec for {name} at {file_path}")
+    if spec.loader is None:
+        raise Exception(f"No loader for module {name} at {file_path}")
+
+    module = importlib.util.module_from_spec(spec)
+
+    # Crucial step: Register the module in sys.modules *before* execution
+    # This prevents issues with relative imports within the module
+    sys.modules[name] = module
+
+    # Execute the module's code in its own namespace
+    try:
+        spec.loader.exec_module(module)
+    except Exception:
+        # If execution fails, remove the module from sys.modules
+        del sys.modules[name]
+        raise
+
+    return module
 
 
 # for python3, we open text files with universal newline support
@@ -495,8 +516,10 @@ def filereplacer(filepath):
                         stripped = firstline.rstrip('\r\n')
                         NL = firstline[len(stripped):]
                         assert NL in ("\r", "\n", "\r\n"), "Bad NL %r" % NL
-                        origlines = chain([stripped],
-                                          (line.rstrip('\r\n') for line in orig))
+                        origlines = chain(
+                            [stripped],
+                            (line.rstrip('\r\n') for line in orig),
+                        )
                     yield tmp, origlines, NL
             else:
                 yield tmp, None, "\n"
diff --git a/pyproject.toml b/pyproject.toml
index cdc748c..95b0bb0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ version = "0.20.3"
 dependencies = [
     "python-daemon>=2.3.0",
     "requests>=2.25.1",
-    "click>=7.1.2",
+    "click>=8.3",
     # tomli is required before python 3.11
     "tomli>=2.3.0 ; python_full_version < '3.11'",
 ]
diff --git a/test/tests.Dockerfile b/test/tests.Dockerfile
index 190a215..da4760b 100644
--- a/test/tests.Dockerfile
+++ b/test/tests.Dockerfile
@@ -19,4 +19,4 @@ RUN uv venv .venv && uv pip install -e . --group=dev
 COPY ./test ./test
 COPY ./homely ./homely
 
-RUN .venv/bin/pytest test -x
+RUN .venv/bin/pytest -W error test -x
diff --git a/uv.lock b/uv.lock
index 1fd41df..dd9fdd2 100644
--- a/uv.lock
+++ b/uv.lock
@@ -299,7 +299,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.11'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
 wheels = [
@@ -356,7 +356,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "click", specifier = ">=7.1.2" },
+    { name = "click", specifier = ">=8.3" },
     { name = "python-daemon", specifier = ">=2.3.0" },
     { name = "requests", specifier = ">=2.25.1" },
     { name = "tomli", marker = "python_full_version < '3.11'", specifier = ">=2.3.0" },