diff --git a/pyproject.toml b/pyproject.toml
index edbcc646..7f0c85b8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,6 +64,8 @@ extend-ignore-names = ["mcs", "test_*"]
 [tool.ruff.lint.extend-per-file-ignores]
 # Allow f-string without an `f` prefix for our custom error formatter.
 "**/questionpy_sdk/webserver/question_ui/errors.py" = ["RUF027"]
+# unused-async (aiohttp handlers must be async even if they don't use it)
+"**/questionpy_sdk/webserver/routes/*" = ["RUF029"]
 
 [tool.ruff.lint.pylint]
 allow-dunder-method-names = ["__get_pydantic_core_schema__"]
diff --git a/questionpy/form/_model.py b/questionpy/form/_model.py
index 7aef91ee..442a14e3 100644
--- a/questionpy/form/_model.py
+++ b/questionpy/form/_model.py
@@ -125,7 +125,7 @@ class _FormModelMeta(ModelMetaclass):
 
     __slots__ = ()
 
-    def __new__(mcs, name: str, bases: tuple[type, ...], namespace: dict, **kwargs: Any) -> type:  # noqa: N804
+    def __new__(mcs, name: str, bases: tuple[type, ...], namespace: dict, **kwargs: Any) -> type:
         annotations = namespace.get("__annotations__", {}).copy()
         new_namespace = {}
         form = OptionsFormDefinition()
diff --git a/questionpy_sdk/commands/package.py b/questionpy_sdk/commands/package.py
index d6871125..147e3d56 100644
--- a/questionpy_sdk/commands/package.py
+++ b/questionpy_sdk/commands/package.py
@@ -109,7 +109,7 @@ def create_qpy_package(
 
     try:
         # Use temp file, otherwise we risk overwriting `out_path` in case of a build error.
-        temp_file = tempfile.NamedTemporaryFile(delete=False)
+        temp_file = tempfile.NamedTemporaryFile(delete=False)  # noqa: SIM115
         temp_file_path = Path(temp_file.name)
 
         try:
diff --git a/questionpy_sdk/package/builder.py b/questionpy_sdk/package/builder.py
index b866840e..d23e8a2b 100644
--- a/questionpy_sdk/package/builder.py
+++ b/questionpy_sdk/package/builder.py
@@ -116,10 +116,10 @@ def _write_manifest(self) -> None:
 
     def _run_hook(self, cmd: str, hook_name: BuildHookName, num: int) -> None:
         log.info("Running %s hook[%d]: '%s'", hook_name, num, cmd)
-        with subprocess.Popen(
+        with subprocess.Popen(  # noqa: S602
             cmd,
             cwd=self._source.path,
-            shell=True,  # noqa: S602
+            shell=True,
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
             text=True,
diff --git a/questionpy_sdk/webserver/question_ui/__init__.py b/questionpy_sdk/webserver/question_ui/__init__.py
index 3c958fc3..663cb024 100644
--- a/questionpy_sdk/webserver/question_ui/__init__.py
+++ b/questionpy_sdk/webserver/question_ui/__init__.py
@@ -437,7 +437,7 @@ def _shuffle_contents(self) -> None:
             child_elements = [child for child in element if isinstance(child, etree._Element)]
             self._random.shuffle(child_elements)
 
-            element.attrib.pop("{%s}shuffle-contents" % self.QPY_NAMESPACE)
+            element.attrib.pop(f"{{{self.QPY_NAMESPACE}}}shuffle-contents")
 
             # Reinsert shuffled elements, preserving non-element nodes
             for i, child in enumerate(child_elements):
diff --git a/questionpy_sdk/webserver/question_ui/errors.py b/questionpy_sdk/webserver/question_ui/errors.py
index 9f142eb1..6e0f2968 100644
--- a/questionpy_sdk/webserver/question_ui/errors.py
+++ b/questionpy_sdk/webserver/question_ui/errors.py
@@ -122,10 +122,9 @@ def __init__(
             template_kwargs["expected"] = expected
             expected_str = " Expected values are {expected}."
 
-        s = "" if isinstance(value, str) or len(value) <= 1 else ""
         super().__init__(
             element=element,
-            template=f"Invalid value{s} {{value}} for attribute {{attribute}} on element {{element}}.{expected_str}",
+            template=f"Invalid value {{value}} for attribute {{attribute}} on element {{element}}.{expected_str}",
             template_kwargs=template_kwargs,
         )
 
diff --git a/tests/questionpy_sdk/commands/conftest.py b/tests/questionpy_sdk/commands/conftest.py
index cd46d20e..fd3e3bc4 100644
--- a/tests/questionpy_sdk/commands/conftest.py
+++ b/tests/questionpy_sdk/commands/conftest.py
@@ -53,13 +53,13 @@ def invoke(*args: Any, **kwargs: Any) -> Result:
             os.chdir(cwd_orig)
 
 
-@pytest.fixture  # noqa: FURB118
-def runner(isolated_runner: tuple[CliRunner, Path]) -> CliRunner:
+@pytest.fixture
+def runner(isolated_runner: tuple[CliRunner, Path]) -> CliRunner:  # noqa: FURB118
     return isolated_runner[0]
 
 
-@pytest.fixture  # noqa: FURB118
-def cwd(isolated_runner: tuple[CliRunner, Path]) -> Path:
+@pytest.fixture
+def cwd(isolated_runner: tuple[CliRunner, Path]) -> Path:  # noqa: FURB118
     return isolated_runner[1]