diff --git a/dev-docs/source/conf.py b/dev-docs/source/conf.py
index dd3fb406d..902e79b50 100644
--- a/dev-docs/source/conf.py
+++ b/dev-docs/source/conf.py
@@ -41,7 +41,7 @@ class GDALMockModule(_MockModule):
 # -- Project information -----------------------------------------------------
 
 project = "Amsterdam DSO-API"
-copyright = f"{date.today().year}, Gemeente Amsterdam"
+copyright = f"{date.today().year}, Gemeente Amsterdam"  # noqa: DTZ011
 author = (
     "Team Datadiensten van het Dataplatform"
     " onder de Directie Digitale Voorzieningen, Gemeente Amsterdam"
diff --git a/pyproject.toml b/pyproject.toml
index d467b6e07..e1c005a0f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -96,4 +96,5 @@ max-complexity = 10
 [tool.ruff.lint.per-file-ignores]
 "**/migrations/*.py" = ["E501"]  # line too long
 "docs/_ext/djangodummy/settings.py" = ["S105"]  # allow hardcoded SECRET_KEY
-"src/tests/**/*.py" = ["S101", "S105", "S106", "S314", "S320"]  # allow asserts, hardcoded passwords, lxml parsing
+"src/tests/settings.py" = ["F405"]  # allow unknown variables via import from *
+"src/tests/**/*.py" = ["DJ008", "S101", "S105", "S106", "S314", "S320", "S608"]  # allow asserts, hardcoded passwords, lxml parsing, SQL injection
diff --git a/src/dso_api/dynamic_api/filters/__init__.py b/src/dso_api/dynamic_api/filters/__init__.py
index 9f13e2227..37ea4312c 100644
--- a/src/dso_api/dynamic_api/filters/__init__.py
+++ b/src/dso_api/dynamic_api/filters/__init__.py
@@ -1,4 +1,4 @@
-from . import lookups  # noqa (import is needed for registration)
+from . import lookups  # noqa: F401 (needed for registration)
 from .backends import DynamicFilterBackend, DynamicOrderingFilter
 from .parser import FilterInput
 
diff --git a/src/dso_api/dynamic_api/filters/backends.py b/src/dso_api/dynamic_api/filters/backends.py
index 729da3ef1..da525ff79 100644
--- a/src/dso_api/dynamic_api/filters/backends.py
+++ b/src/dso_api/dynamic_api/filters/backends.py
@@ -51,11 +51,10 @@ class View(GenericAPIView):
     ordering_param = "_sort"  # Enforce DSO-specific name.
 
     def get_ordering(self, request, queryset, view):
-        if self.ordering_param not in request.query_params:
+        if self.ordering_param not in request.query_params and "sorteer" in request.query_params:
             # Allow DSO 1.0 Dutch "sorteer" parameter
             # Can adjust 'self' as this instance is recreated each request.
-            if "sorteer" in request.query_params:
-                self.ordering_param = "sorteer"
+            self.ordering_param = "sorteer"
 
         ordering = super().get_ordering(request, queryset, view)
         if ordering is None:
diff --git a/src/dso_api/dynamic_api/filters/values.py b/src/dso_api/dynamic_api/filters/values.py
index cc4de0c76..8b6323059 100644
--- a/src/dso_api/dynamic_api/filters/values.py
+++ b/src/dso_api/dynamic_api/filters/values.py
@@ -42,7 +42,8 @@ def str2isodate(value: str) -> date | datetime | None:
     # for something that has no time at inputs, allowing to check against a complete day
     # instead of exactly midnight.
     try:
-        return datetime.strptime(value, "%Y-%m-%d").date()
+        # while this uses strptime(), it only takes the date, which has no tzinfo
+        return datetime.strptime(value, "%Y-%m-%d").date()  # noqa: DTZ007
     except ValueError:
         pass
 
@@ -61,7 +62,8 @@ def str2time(value: str) -> time:
     """Parse a HH:MM:SS or HH:MM time formatted string."""
     for format in ("%H:%M:%S", "%H:%M", "%H:%M:%S.%f"):
         try:
-            return datetime.strptime(value, format).time()
+            # while this uses strptime(), it only takes the time, so no tzinfo neeed.
+            return datetime.strptime(value, format).time()  # noqa: DTZ007
         except ValueError:
             pass
 
diff --git a/src/dso_api/dynamic_api/remote/clients.py b/src/dso_api/dynamic_api/remote/clients.py
index 3ab8fbae7..a7b141863 100644
--- a/src/dso_api/dynamic_api/remote/clients.py
+++ b/src/dso_api/dynamic_api/remote/clients.py
@@ -89,13 +89,10 @@ def _get_http_error(response: HTTPResponse) -> APIException:
     # This translates some errors into a 502 "Bad Gateway" or 503 "Gateway Timeout"
     # error to reflect the fact that this API is calling another service as backend.
 
+    # Consider the actual JSON response here,
+    # unless the request hit the completely wrong page (it got an HTML page).
     content_type = response.headers.get("content-type", "")
-    if content_type.startswith("text/html"):
-        # HTML error, probably hit the completely wrong page.
-        detail_message = None
-    else:
-        # Consider the actual JSON response to be relevant here.
-        detail_message = response.data.decode()
+    detail_message = response.data.decode() if not content_type.startswith("text/html") else None
 
     if response.status == 400:  # "bad request"
         if content_type == "application/problem+json":
diff --git a/src/dso_api/dynamic_api/routers.py b/src/dso_api/dynamic_api/routers.py
index 048f6e640..1dc6db22c 100644
--- a/src/dso_api/dynamic_api/routers.py
+++ b/src/dso_api/dynamic_api/routers.py
@@ -259,7 +259,7 @@ def _build_db_models(self, db_datasets: Iterable[Dataset]) -> list[type[DynamicM
         # Because dataset are related, we need to 'prewarm'
         # the datasets cache (in schematools)
         for dataset in db_datasets:
-            dataset.schema
+            dataset.schema  # noqa: B018 (load data early)
 
         for dataset in db_datasets:  # type: Dataset
             dataset_id = dataset.schema.id  # not dataset.name which is mangled.
diff --git a/src/dso_api/dynamic_api/serializers/base.py b/src/dso_api/dynamic_api/serializers/base.py
index eacf63525..5a59ef342 100644
--- a/src/dso_api/dynamic_api/serializers/base.py
+++ b/src/dso_api/dynamic_api/serializers/base.py
@@ -437,18 +437,19 @@ def get_fields(self):
         # Remove fields from the _links field too. This is not done in the serializer
         # itself as that creates a cross-dependency between the parent/child.fields property.
         links_field = fields.get("_links")
-        if links_field is not None and isinstance(links_field, DynamicLinksSerializer):
-            if self.fields_to_display.reduced():
-                # The 'invalid_fields' is not checked against here, as that already happened
-                # for the top-level fields reduction.
-                main_and_links_fields = self.get_valid_field_names(fields)
-                fields_to_keep, _ = self.fields_to_display.get_allow_list(main_and_links_fields)
-                fields_to_keep.update(links_field.fields_always_included)
-                links_field.fields = {
-                    name: field
-                    for name, field in links_field.fields.items()
-                    if name in fields_to_keep
-                }
+        if (
+            links_field is not None
+            and isinstance(links_field, DynamicLinksSerializer)
+            and self.fields_to_display.reduced()
+        ):
+            # The 'invalid_fields' is not checked against here, as that already happened
+            # for the top-level fields reduction.
+            main_and_links_fields = self.get_valid_field_names(fields)
+            fields_to_keep, _ = self.fields_to_display.get_allow_list(main_and_links_fields)
+            fields_to_keep.update(links_field.fields_always_included)
+            links_field.fields = {
+                name: field for name, field in links_field.fields.items() if name in fields_to_keep
+            }
 
         return fields
 
diff --git a/src/dso_api/dynamic_api/utils.py b/src/dso_api/dynamic_api/utils.py
index 131b0f4ba..ad66cdad3 100644
--- a/src/dso_api/dynamic_api/utils.py
+++ b/src/dso_api/dynamic_api/utils.py
@@ -180,9 +180,8 @@ def has_field_access(user_scopes: UserScopes, field: DatasetFieldSchema) -> bool
     table_access = related and user_scopes.has_table_fields_access(related_table)
     field_access = user_scopes.has_field_access(field)
 
-    if related and table_access and field_access:
-        return True
-    return bool(not related and field_access)
+    # Related fields need table access, others only need field access.
+    return (related and table_access and field_access) or (not related and field_access)
 
 
 def limit_queryset_for_scopes(
diff --git a/src/dso_api/dynamic_api/views/doc.py b/src/dso_api/dynamic_api/views/doc.py
index b544475ce..9419d4196 100644
--- a/src/dso_api/dynamic_api/views/doc.py
+++ b/src/dso_api/dynamic_api/views/doc.py
@@ -232,7 +232,7 @@ class LookupContext(NamedTuple):
 
 def lookup_context(op, example, descr):
     # disable mark_safe() warnings because this is static HTML in this very file.
-    return LookupContext(op, mark_safe(example), mark_safe(descr))  # nosec B308 B703
+    return LookupContext(op, mark_safe(example), mark_safe(descr))  # noqa: B308, B703, S308
 
 
 # This should match ALLOWED_SCALAR_LOOKUPS in filters.parser (except for the "exact" lookup).
@@ -321,7 +321,7 @@ def _table_context(ds: Dataset, table: DatasetTableSchema):
         exports.append(export_info)
 
     if (temporal := table.temporal) is not None:
-        for name, fields in temporal.dimensions.items():
+        for name in temporal.dimensions:
             filters.append(
                 {
                     "name": name,
@@ -546,7 +546,7 @@ def _filter_payload(
         "name": name,
         "type": type.capitalize(),
         "is_deprecated": is_deprecated,
-        "value_example": mark_safe(value_example or ""),  # nosec B308 B703 (is static HTML)
+        "value_example": mark_safe(value_example or ""),  # noqa: B308, B703, S308 (is static HTML)
         "lookups": [LOOKUP_CONTEXT[op] for op in lookups],
         "auth": _fix_auth(field.auth | field.table.auth | field.table.dataset.auth),
     }
diff --git a/src/dso_api/dynamic_api/views/index.py b/src/dso_api/dynamic_api/views/index.py
index 69d08ffb8..ca64c7635 100644
--- a/src/dso_api/dynamic_api/views/index.py
+++ b/src/dso_api/dynamic_api/views/index.py
@@ -62,7 +62,7 @@ def get(self, request, *args, **kwargs):
                 # Due to too many of these issues, avoid breaking the whole index listing for this.
                 # Plus, having the front page give a 500 error is not that nice.
                 logging.exception(
-                    f"Internal URL resolving is broken for schema {ds.schema.id}: {e}"
+                    "Internal URL resolving is broken for schema {%s}: {%s}", ds.schema.id, str(e)
                 )
                 env = []
                 rel = []
diff --git a/src/rest_framework_dso/embedding.py b/src/rest_framework_dso/embedding.py
index b5db588ba..6d802b550 100644
--- a/src/rest_framework_dso/embedding.py
+++ b/src/rest_framework_dso/embedding.py
@@ -226,7 +226,7 @@ def embedded_serializer(self) -> serializers.Serializer:
         child = (
             serializer.child if isinstance(serializer, serializers.ListSerializer) else serializer
         )
-        child.fields  # noqa: perform early checks
+        child.fields  # noqa: B018, perform early checks
 
         # Allow the output format to customize the serializer for the embedded relation.
         renderer = self.serializer.context["request"].accepted_renderer
diff --git a/src/rest_framework_dso/openapi.py b/src/rest_framework_dso/openapi.py
index 077675ad6..21c065e4d 100644
--- a/src/rest_framework_dso/openapi.py
+++ b/src/rest_framework_dso/openapi.py
@@ -285,18 +285,17 @@ def _map_serializer_field(self, field, direction, bypass_extensions=False):
         This method transforms the serializer field into a OpenAPI definition.
         We've overwritten this to change the geometry field representation.
         """
-        if not hasattr(field, "_spectacular_annotation"):
-            # Fix support for missing field types:
-            if isinstance(field, GeometryField):
-                # Not using `rest_framework_gis.schema.GeoFeatureAutoSchema` here,
-                # as it duplicates components instead of using $ref.
-                if field.parent and hasattr(field.parent.Meta, "model"):
-                    # model_field.geom_type is uppercase
-                    model_field = field.parent.Meta.model._meta.get_field(field.source)
-                    geojson_type = GEOM_TYPES_TO_GEOJSON.get(model_field.geom_type, "Geometry")
-                else:
-                    geojson_type = "Geometry"
-                return {"$ref": f"#/components/schemas/{geojson_type}"}
+        # Fix support for missing field types:
+        if not hasattr(field, "_spectacular_annotation") and isinstance(field, GeometryField):
+            # Not using `rest_framework_gis.schema.GeoFeatureAutoSchema` here,
+            # as it duplicates components instead of using $ref.
+            if field.parent and hasattr(field.parent.Meta, "model"):
+                # model_field.geom_type is uppercase
+                model_field = field.parent.Meta.model._meta.get_field(field.source)
+                geojson_type = GEOM_TYPES_TO_GEOJSON.get(model_field.geom_type, "Geometry")
+            else:
+                geojson_type = "Geometry"
+            return {"$ref": f"#/components/schemas/{geojson_type}"}
 
         return super()._map_serializer_field(field, direction, bypass_extensions=bypass_extensions)
 
diff --git a/src/rest_framework_dso/pagination.py b/src/rest_framework_dso/pagination.py
index 8efd2ddf3..df0b43c77 100644
--- a/src/rest_framework_dso/pagination.py
+++ b/src/rest_framework_dso/pagination.py
@@ -60,12 +60,14 @@ def paginate_queryset(self, queryset, request, view=None):
 
     def get_page_size(self, request):
         """Allow the ``page_size`` parameter was fallback."""
-        if self.page_size_query_param not in request.query_params:
+        if (
+            self.page_size_query_param not in request.query_params
+            and "page_size" in request.query_params
+        ):
             # Allow our classic rest "page_size" setting that we leaked into
             # the public API to be used as fallback. This only affects the
             # current request (attribute is set on self, not the class).
-            if "page_size" in request.query_params:
-                self.page_size_query_param = "page_size"
+            self.page_size_query_param = "page_size"
 
         return super().get_page_size(request)
 
diff --git a/src/rest_framework_dso/paginator.py b/src/rest_framework_dso/paginator.py
index 0442abdac..9249e50fe 100644
--- a/src/rest_framework_dso/paginator.py
+++ b/src/rest_framework_dso/paginator.py
@@ -30,6 +30,7 @@ def __init__(self, object_list, per_page, orphans=0, allow_empty_first_page=True
                 "DSOPaginator instantiated with non-zero value in orphans. \
                     Orphans are not supported by this class and will be ignored.",
                 RuntimeWarning,
+                stacklevel=2,
             )
         super().__init__(object_list, per_page, 0, allow_empty_first_page)
 
diff --git a/src/rest_framework_dso/renderers.py b/src/rest_framework_dso/renderers.py
index 8f32209ed..a4ed24060 100644
--- a/src/rest_framework_dso/renderers.py
+++ b/src/rest_framework_dso/renderers.py
@@ -10,6 +10,7 @@
 import orjson
 from django.conf import settings
 from django.urls import reverse
+from django.utils.timezone import get_current_timezone
 from rest_framework import renderers
 from rest_framework.relations import HyperlinkedRelatedField
 from rest_framework.serializers import ListSerializer, Serializer, SerializerMethodField
@@ -91,7 +92,7 @@ def finalize_response(self, response, renderer_context: dict):
     def get_http_headers(self, renderer_context: dict):
         """Return the http headers for the response."""
         if self.content_disposition:
-            now = datetime.now().isoformat()
+            now = datetime.now(tz=get_current_timezone()).isoformat()
             dataset_id = renderer_context.get("dataset_id", "dataset")
             table_id = renderer_context.get("table_id", "table")
             return {
@@ -338,11 +339,8 @@ def _render_geojson(self, data, request=None):
                 yield self._render_geojson_detail(data, request=request)
                 return
 
-            if "_embed" in data:
-                # Must be a listing, not a detail view which may also have _embed.
-                collections = data["_embed"]
-            else:
-                collections = data
+            # If it's a listing, remove the _embed wrapper.
+            collections = data.get("_embed", data)
         elif isinstance(data, (list, ReturnGenerator, GeneratorType)):
             collections = {"gen": data}
         else:
diff --git a/src/tests/conftest.py b/src/tests/conftest.py
index f1ec6cfc5..90b71350f 100644
--- a/src/tests/conftest.py
+++ b/src/tests/conftest.py
@@ -12,7 +12,7 @@
 from django.core.handlers.wsgi import WSGIRequest
 from django.db import connection
 from django.utils.functional import SimpleLazyObject
-from django.utils.timezone import make_aware
+from django.utils.timezone import get_current_timezone
 from jwcrypto.jwt import JWT
 from psycopg2.sql import SQL, Identifier
 from rest_framework.request import Request
@@ -26,8 +26,8 @@
 from tests.utils import api_request_with_scopes, to_drf_request
 
 HERE = Path(__file__).parent
-DATE_2021_FEB = make_aware(datetime(2021, 2, 28, 10, 0))
-DATE_2021_JUNE = make_aware(datetime(2021, 6, 11, 10, 0))
+DATE_2021_FEB = datetime(2021, 2, 28, 10, 0, tzinfo=get_current_timezone())
+DATE_2021_JUNE = datetime(2021, 6, 11, 10, 0, tzinfo=get_current_timezone())
 
 
 @pytest.fixture()
@@ -367,7 +367,7 @@ def afval_container(afval_container_model, afval_cluster):
         eigenaar_naam="Dataservices",
         # set to fixed dates to the CSV export can also check for desired formatting
         datum_creatie=date(2021, 1, 3),
-        datum_leegmaken=make_aware(datetime(2021, 1, 3, 12, 13, 14)),
+        datum_leegmaken=datetime(2021, 1, 3, 12, 13, 14, tzinfo=get_current_timezone()),
         cluster=afval_cluster,
         geometry=Point(10, 10),  # no SRID on purpose, should use django model field.
     )
@@ -571,10 +571,16 @@ def movies_model(movies_dataset, dynamic_models):
 def movies_data(movies_model, movies_category):
     return [
         movies_model.objects.create(
-            id=3, name="foo123", category=movies_category, date_added=datetime(2020, 1, 1, 0, 45)
+            id=3,
+            name="foo123",
+            category=movies_category,
+            date_added=datetime(2020, 1, 1, 0, 45, tzinfo=get_current_timezone()),
         ),
         movies_model.objects.create(
-            id=4, name="test", category=movies_category, date_added=datetime(2020, 2, 2, 13, 15)
+            id=4,
+            name="test",
+            category=movies_category,
+            date_added=datetime(2020, 2, 2, 13, 15, tzinfo=get_current_timezone()),
         ),
     ]
 
diff --git a/src/tests/settings.py b/src/tests/settings.py
index 3c87b9d53..b50c9ab9e 100644
--- a/src/tests/settings.py
+++ b/src/tests/settings.py
@@ -1,6 +1,4 @@
-from pathlib import Path
-
-from dso_api.settings import *
+from dso_api.settings import *  # noqa: F403, F405
 
 # The reason the settings are defined here, is to make them independent
 # of the regular project sources. Otherwise, the project needs to have
diff --git a/src/tests/test_dynamic_api/remote/test_views.py b/src/tests/test_dynamic_api/remote/test_views.py
index dc8a29c4a..f3326f6be 100644
--- a/src/tests/test_dynamic_api/remote/test_views.py
+++ b/src/tests/test_dynamic_api/remote/test_views.py
@@ -630,8 +630,8 @@ def respond(request):
 HCBRK_FILES = Path(__file__).parent.parent.parent / "files" / "haalcentraalbrk"
 HCBRK_NATUURLIJKPERSOON = (HCBRK_FILES / "hcbrk_natuurlijkpersoon.json").read_text()
 HCBRK_ONROERENDE_ZAAK = (HCBRK_FILES / "hcbrk_onroerendezaak.json").read_text()
-DSO_NATUURLIJKPERSOON = json.load(open(HCBRK_FILES / "dso_natuurlijkpersoon.json"))
-DSO_ONROERENDE_ZAAK = json.load(open(HCBRK_FILES / "dso_onroerendezaak.json"))
+DSO_NATUURLIJKPERSOON = json.loads((HCBRK_FILES / "dso_natuurlijkpersoon.json").read_text())
+DSO_ONROERENDE_ZAAK = json.loads((HCBRK_FILES / "dso_onroerendezaak.json").read_text())
 
 
 @pytest.mark.django_db
diff --git a/src/tests/test_dynamic_api/test_serializers.py b/src/tests/test_dynamic_api/test_serializers.py
index 9ab73c30e..494150374 100644
--- a/src/tests/test_dynamic_api/test_serializers.py
+++ b/src/tests/test_dynamic_api/test_serializers.py
@@ -392,10 +392,10 @@ def test_backwards_relation(drf_request, gebieden_models):
                     "volgnummer": 1,
                     "identificatie": "0363",
                 },
-                "schema": "https://schemas.data.amsterdam.nl/datasets/gebieden/dataset#stadsdelen",  # NoQA
+                "schema": "https://schemas.data.amsterdam.nl/datasets/gebieden/dataset#stadsdelen",
                 "wijken": [
                     {
-                        "href": "http://testserver/v1/gebieden/wijken/03630000000001/?volgnummer=1",  # NoQA
+                        "href": "http://testserver/v1/gebieden/wijken/03630000000001/?volgnummer=1",
                         "title": "03630000000001.1",
                         "volgnummer": 1,
                         "identificatie": "03630000000001",
@@ -1155,7 +1155,7 @@ def test_request_protected_fields_without_scopes_should_not_be_allowed(
         # Trying to fetch the data (Serializer tries to render the data)
         # should not be allowed.
         with pytest.raises(PermissionDenied):
-            monumenten_serializer.data
+            monumenten_serializer.data  # noqa: B018
 
     @staticmethod
     def test_request_expand_scope_for_protected_expand_should_not_be_allowed(
@@ -1196,4 +1196,4 @@ def test_request_expand_scope_for_protected_expand_should_not_be_allowed(
         # Trying to fetch the data (Serializer tries to render the data)
         # should not be allowed.
         with pytest.raises(PermissionDenied):
-            monumenten_serializer.data
+            monumenten_serializer.data  # noqa: B018
diff --git a/src/tests/test_dynamic_api/test_temporal_actions.py b/src/tests/test_dynamic_api/test_temporal_actions.py
index 5542a566d..bc7264448 100644
--- a/src/tests/test_dynamic_api/test_temporal_actions.py
+++ b/src/tests/test_dynamic_api/test_temporal_actions.py
@@ -1,4 +1,4 @@
-from datetime import date, datetime
+from datetime import date, datetime, timezone
 from urllib.parse import parse_qs, urlparse
 
 import pytest
@@ -18,7 +18,7 @@ def stadsdelen(gebieden_models):
         id="03630000000016.1",
         identificatie="03630000000016",
         volgnummer=1,
-        registratiedatum=datetime(2006, 6, 12, 5, 40, 12),
+        registratiedatum=datetime(2006, 6, 12, 5, 40, 12, tzinfo=timezone.utc),
         begin_geldigheid=date(2006, 6, 1),
         eind_geldigheid=date(2015, 1, 1),
         naam="Zuidoost",
@@ -28,7 +28,7 @@ def stadsdelen(gebieden_models):
         id="03630000000016.2",
         identificatie="03630000000016",
         volgnummer=2,
-        registratiedatum=datetime(2015, 1, 1, 5, 40, 12),
+        registratiedatum=datetime(2015, 1, 1, 5, 40, 12, tzinfo=timezone.utc),
         begin_geldigheid=date(2015, 1, 1),
         eind_geldigheid=None,
         naam="Zuidoost",
@@ -46,7 +46,7 @@ def gebied(gebieden_models, stadsdelen, buurt):
         id="03630950000019.1",
         identificatie="03630950000019",
         volgnummer=1,
-        registratiedatum=datetime(2015, 1, 1, 5, 40, 12),
+        registratiedatum=datetime(2015, 1, 1, 5, 40, 12, tzinfo=timezone.utc),
         begin_geldigheid=date(2014, 2, 20),
         naam="Bijlmer-Centrum",
     )
diff --git a/src/tests/test_dynamic_api/test_views_api.py b/src/tests/test_dynamic_api/test_views_api.py
index 95cd5dccd..b8305eb42 100644
--- a/src/tests/test_dynamic_api/test_views_api.py
+++ b/src/tests/test_dynamic_api/test_views_api.py
@@ -2041,12 +2041,14 @@ def test_list_count_falsy(self, api_client, afval_container, filled_router, data
         assert "totalPages" not in data["page"]
 
 
+def as_is(data):
+    return data
+
+
 @pytest.mark.django_db
 class TestFormats:
     """Prove that common rendering formats work as expected"""
 
-    as_is = lambda data: data
-
     def test_point_wgs84(self):
         """See that our WGS84_POINT is indeed a lon/lat coordinate.
         This only compares a rounded version, as there can be subtle differences
diff --git a/src/tests/test_dynamic_api/test_views_mvt.py b/src/tests/test_dynamic_api/test_views_mvt.py
index 22e41492f..72baaa9a7 100644
--- a/src/tests/test_dynamic_api/test_views_mvt.py
+++ b/src/tests/test_dynamic_api/test_views_mvt.py
@@ -3,7 +3,7 @@
 import mapbox_vector_tile
 import pytest
 from django.contrib.gis.geos import Point
-from django.utils.timezone import make_aware
+from django.utils.timezone import get_current_timezone
 
 CONTENT_TYPE = "application/vnd.mapbox-vector-tile"
 
@@ -119,7 +119,7 @@ def test_mvt_content(api_client, afval_container_model, afval_cluster, filled_ro
         eigenaar_naam="Dataservices",
         # set to fixed dates to the CSV export can also check for desired formatting
         datum_creatie=date(2021, 1, 3),
-        datum_leegmaken=make_aware(datetime(2021, 1, 3, 12, 13, 14)),
+        datum_leegmaken=datetime(2021, 1, 3, 12, 13, 14, tzinfo=get_current_timezone()),
         cluster=afval_cluster,
         geometry=Point(123207.6558130105, 486624.6399002579),
     )
diff --git a/src/tests/test_dynamic_api/test_views_wfs.py b/src/tests/test_dynamic_api/test_views_wfs.py
index eaf1df18c..f23c28234 100644
--- a/src/tests/test_dynamic_api/test_views_wfs.py
+++ b/src/tests/test_dynamic_api/test_views_wfs.py
@@ -35,8 +35,9 @@ def test_wfs_index(
                         {
                             "name": "production",
                             "api_url": f"{base}/v1/wfs/afvalwegingen/",
-                            "specification_url": f"{base}/v1/wfs/afvalwegingen/"
-                            + "?SERVICE=WFS&REQUEST=GetCapabilities",
+                            "specification_url": (
+                                f"{base}/v1/wfs/afvalwegingen/?SERVICE=WFS&REQUEST=GetCapabilities"
+                            ),
                             "documentation_url": f"{base}/v1/docs/wfs-datasets/afvalwegingen.html",
                         }
                     ],
@@ -69,8 +70,9 @@ def test_wfs_index(
                         {
                             "name": "production",
                             "api_url": f"{base}/v1/wfs/fietspaaltjes/",
-                            "specification_url": f"{base}/v1/wfs/fietspaaltjes/"
-                            + "?SERVICE=WFS&REQUEST=GetCapabilities",
+                            "specification_url": (
+                                f"{base}/v1/wfs/fietspaaltjes/?SERVICE=WFS&REQUEST=GetCapabilities"
+                            ),
                             "documentation_url": f"{base}/v1/docs/wfs-datasets/fietspaaltjes.html",
                         }
                     ],
diff --git a/src/tests/test_rest_framework_dso/models.py b/src/tests/test_rest_framework_dso/models.py
index 814b7a6e8..1b3849b82 100644
--- a/src/tests/test_rest_framework_dso/models.py
+++ b/src/tests/test_rest_framework_dso/models.py
@@ -20,6 +20,9 @@ class MovieUser(models.Model, NonTemporalMixin):
     class Meta:
         app_label = "test_rest_framework_dso"
 
+    def __str__(self):
+        return self.name
+
 
 class Category(models.Model, NonTemporalMixin):
     """Used to test FK relations."""
@@ -33,6 +36,9 @@ class Meta:
         app_label = "test_rest_framework_dso"
         ordering = ("name",)
 
+    def __str__(self):
+        return self.name
+
 
 class Actor(models.Model, NonTemporalMixin):
     """Used to test M2M relations"""
@@ -44,6 +50,9 @@ class Meta:
         app_label = "test_rest_framework_dso"
         ordering = ("name",)
 
+    def __str__(self):
+        return self.name
+
 
 class Movie(models.Model, NonTemporalMixin):
     name = models.CharField(max_length=100)
@@ -67,3 +76,6 @@ class Location(models.Model, NonTemporalMixin):
 
     class Meta:
         app_label = "test_rest_framework_dso"
+
+    def __str__(self):
+        return str(self.geometry)
diff --git a/src/tests/utils.py b/src/tests/utils.py
index 907cfe51c..c1852dfc0 100644
--- a/src/tests/utils.py
+++ b/src/tests/utils.py
@@ -120,7 +120,7 @@ def read_response_partial(response: HttpResponseBase) -> tuple[str, Exception |
     try:
         for chunk in iter(response):
             buffer.write(chunk)
-    except Exception as e:  # noqa: B902
+    except Exception as e:  # noqa: B902, BLE001
         return buffer.getvalue().decode(), e
     else:
         return buffer.getvalue().decode(), None