diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f8978332f..a9db3cd4a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -34,6 +34,7 @@ repos:
     hooks:
       - id: flake8
         additional_dependencies:
+        - flake8-no-pep420==2.4.0
         - flake8-pyi==22.11.0
         types: []
         files: ^.*.pyi?$
diff --git a/django-stubs/contrib/postgres/forms/jsonb.py b/django-stubs/contrib/postgres/forms/jsonb.pyi
similarity index 66%
rename from django-stubs/contrib/postgres/forms/jsonb.py
rename to django-stubs/contrib/postgres/forms/jsonb.pyi
index b03cda8a7..5262da9ee 100644
--- a/django-stubs/contrib/postgres/forms/jsonb.py
+++ b/django-stubs/contrib/postgres/forms/jsonb.pyi
@@ -2,8 +2,6 @@
 
 from django.forms import JSONField as BuiltinJSONField
 
-
 # Deprecated, removed in 4.0
 class JSONField(BuiltinJSONField):
-    def __init__(self, *args: Any, **kwargs: Any) -> None:
-        ...
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
diff --git a/setup.cfg b/setup.cfg
index 3dacf62ef..a50af6c36 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -4,3 +4,6 @@ extend-ignore = E203
 max_line_length = 120
 per-file-ignores =
     *.pyi: B, E301, E302, E305, E501, E701, E741, E743, NQA102, F401, F403, F405, F822, Y021, Y024, Y041, Y043
+    setup.py: INP001
+    tests/*.py: INP001
+    django_stubs_ext/tests/*.py: INP001