diff --git a/fawltydeps/extract_declared_dependencies.py b/fawltydeps/extract_declared_dependencies.py
index 37a8d636..2702abf0 100644
--- a/fawltydeps/extract_declared_dependencies.py
+++ b/fawltydeps/extract_declared_dependencies.py
@@ -165,7 +165,7 @@ def parse_value(value: str) -> Iterator[DeclaredDependency]:
         # See:  https://github.com/nexB/pip-requirements-parser/pull/17
 
         # https://github.com/nexB/pip-requirements-parser/pull/19#discussion_r1379279880
-        temp_file = NamedTemporaryFile(
+        temp_file = NamedTemporaryFile(  # noqa: SIM115
             "wt",
             delete=False,
             # we prefer utf8 encoded strings, but ...
diff --git a/fawltydeps/packages.py b/fawltydeps/packages.py
index d9efc63b..d30b2a85 100644
--- a/fawltydeps/packages.py
+++ b/fawltydeps/packages.py
@@ -412,8 +412,8 @@ def _venv_create(venv_dir: Path, uv_exe: Optional[str] = None) -> None:
         if uv_exe is None:  # use venv module
             venv.create(venv_dir, clear=True, with_pip=True)
         else:
-            subprocess.run(
-                [uv_exe, "venv", "--python", sys.executable, str(venv_dir)],  # noqa: S603
+            subprocess.run(  # noqa: S603
+                [uv_exe, "venv", "--python", sys.executable, str(venv_dir)],
                 check=True,
             )
 
@@ -474,8 +474,8 @@ def install_helper(*packages: str) -> int:
             Return the subprocess exit code from the install process.
             """
             argv = cls._venv_install_cmd(venv_dir, uv_exe) + list(packages)
-            proc = subprocess.run(
-                argv,  # noqa: S603
+            proc = subprocess.run(  # noqa: S603
+                argv,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.STDOUT,
                 text=True,
diff --git a/tests/conftest.py b/tests/conftest.py
index 18f7bbf5..370d9d0b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -14,7 +14,7 @@
 from .project_helpers import TarballPackage
 
 
-@pytest.fixture()
+@pytest.fixture
 def inside_tmp_path(monkeypatch, tmp_path):
     """Convenience fixture to run a test with CWD set to tmp_path.
 
@@ -26,8 +26,8 @@ def inside_tmp_path(monkeypatch, tmp_path):
     return tmp_path
 
 
-@pytest.fixture()
-def local_pypi(request, monkeypatch):  # noqa: PT004
+@pytest.fixture
+def local_pypi(request, monkeypatch):
     cache_dir = TarballPackage.cache_dir(request.config.cache)
     TarballPackage.get_tarballs(request.config.cache)
     # Make sure we install from the local repo, and not from PyPI.
@@ -35,7 +35,7 @@ def local_pypi(request, monkeypatch):  # noqa: PT004
 
     # uv does not (yet) allow this to be configured via the environment, so we
     # need to go via a temporary config file:
-    tmp_uv_config = NamedTemporaryFile("wt", delete=False, suffix=".toml")
+    tmp_uv_config = NamedTemporaryFile("wt", delete=False, suffix=".toml")  # noqa: SIM115
     try:
         tmp_uv_config.write(
             dedent(f"""
@@ -58,7 +58,7 @@ def local_pypi(request, monkeypatch):  # noqa: PT004
         Path(tmp_uv_config.name).unlink()
 
 
-@pytest.fixture()
+@pytest.fixture
 def write_tmp_files(tmp_path: Path):
     def _inner(file_contents: Dict[str, Union[str, bytes]]) -> Path:
         for filename, contents in file_contents.items():
@@ -74,7 +74,7 @@ def _inner(file_contents: Dict[str, Union[str, bytes]]) -> Path:
     return _inner
 
 
-@pytest.fixture()
+@pytest.fixture
 def fake_venv(tmp_path):
     def create_one_fake_venv(
         fake_packages: Dict[str, Set[str]], *, venv_dir: Optional[Path] = None
@@ -105,7 +105,7 @@ def create_one_fake_venv(
     return create_one_fake_venv
 
 
-@pytest.fixture()
+@pytest.fixture
 def isolate_default_resolver(
     fake_venv: Callable[[Dict[str, Set[str]]], Tuple[Path, Path]], monkeypatch
 ):
@@ -139,7 +139,7 @@ def inner(fake_packages: Dict[str, Set[str]]) -> Path:
     return inner
 
 
-@pytest.fixture()
+@pytest.fixture
 def fake_project(write_tmp_files, fake_venv):  # noqa: C901
     """Create a temporary Python project with the given contents/properties.
 
@@ -226,9 +226,9 @@ def format_pixi_toml(deps: Deps, extras: ExtraDeps) -> str:
                 [dependencies]
                 """
         ) + "\n".join(f'{dep} = "*"' for dep in deps)
-        for feature, deps in extras.items():
+        for feature, extra_deps in extras.items():
             ret += f"\n[feature.{feature}.dependencies]\n"
-            ret += "\n".join(f'{dep} = "*"' for dep in deps)
+            ret += "\n".join(f'{dep} = "*"' for dep in extra_deps)
         return ret
 
     def format_deps(
@@ -281,7 +281,7 @@ def create_one_fake_project(
     return create_one_fake_project
 
 
-@pytest.fixture()
+@pytest.fixture
 def project_with_setup_and_requirements(fake_project):
     return fake_project(
         files_with_declared_deps={
@@ -296,7 +296,7 @@ def project_with_setup_and_requirements(fake_project):
     )
 
 
-@pytest.fixture()
+@pytest.fixture
 def project_with_setup_with_cfg_pyproject_and_requirements(fake_project):
     return fake_project(
         files_with_declared_deps={
@@ -321,7 +321,7 @@ def project_with_setup_with_cfg_pyproject_and_requirements(fake_project):
     )
 
 
-@pytest.fixture()
+@pytest.fixture
 def project_with_multiple_python_files(fake_project):
     return fake_project(
         declared_deps=["pandas", "click"],
@@ -334,7 +334,7 @@ def project_with_multiple_python_files(fake_project):
     )
 
 
-@pytest.fixture()
+@pytest.fixture
 def setup_fawltydeps_config(write_tmp_files):
     """Write a custom tmp_path/pyproject.toml with a [tool.fawltydeps] section.
 
diff --git a/tests/test_extract_imports_simple.py b/tests/test_extract_imports_simple.py
index b643c4db..d66a6819 100644
--- a/tests/test_extract_imports_simple.py
+++ b/tests/test_extract_imports_simple.py
@@ -76,7 +76,7 @@ def cell_template(cell_type: str, source: List[str]):
     return json.dumps(notebook, indent=2)
 
 
-@pytest.fixture()
+@pytest.fixture
 def write_code_sources(write_tmp_files):
     """A wrapper around write_tmp_files() that return CodeSource objects."""
 
diff --git a/tests/test_settings.py b/tests/test_settings.py
index d6730959..a4aa1767 100644
--- a/tests/test_settings.py
+++ b/tests/test_settings.py
@@ -76,7 +76,7 @@ def make_settings_dict(**kwargs):
     return ret
 
 
-@pytest.fixture()
+@pytest.fixture
 def setup_env(monkeypatch):
     """Allow setup of fawltydeps_* env vars in a test case."""
 
diff --git a/tests/test_traverse_project.py b/tests/test_traverse_project.py
index b28f330a..4fef5ea5 100644
--- a/tests/test_traverse_project.py
+++ b/tests/test_traverse_project.py
@@ -43,7 +43,7 @@ class TraverseProjectVector:
     # These are the exceptions we expect to be raised, or warnings to be logged
     expect_raised: Optional[Type[Exception]] = None
     expect_warnings: List[str] = dataclasses.field(default_factory=list)
-    skip_me: Callable[[], Optional[str]] = lambda: None  # noqa: E731
+    skip_me: Callable[[], Optional[str]] = lambda: None
 
 
 def on_windows(msg: str) -> Callable[[], Optional[str]]: