diff --git a/ca/django_ca/management/base.py b/ca/django_ca/management/base.py
index 067be5782..4959e86b1 100644
--- a/ca/django_ca/management/base.py
+++ b/ca/django_ca/management/base.py
@@ -84,6 +84,16 @@ class BinaryOutputWrapper(OutputWrapper):
     def __init__(self, out: typing.BinaryIO, ending: bytes = b"\n") -> None:
         super().__init__(out, ending=ending)  # type: ignore[arg-type]
 
+    def flush(self) -> None:
+        """Overwritten from base class so we don't try to flush when the stream is already closed.
+
+        Starting with Python 3.13, we see some untraceable teardown code call flush() despite the stream
+        already being closed.
+        """
+        if self._out.closed is True:  # pragma: only py>=3.13
+            return
+        super().flush()
+
     def write(  # type: ignore[override]
         self,
         msg: Union[str, bytes] = b"",
diff --git a/ca/django_ca/pydantic/type_aliases.py b/ca/django_ca/pydantic/type_aliases.py
index 3e21a22fb..dac6fb018 100644
--- a/ca/django_ca/pydantic/type_aliases.py
+++ b/ca/django_ca/pydantic/type_aliases.py
@@ -143,6 +143,9 @@ def str_loader(value: str) -> T:
 
 NonEmptyOrderedSetTypeVar = TypeVar("NonEmptyOrderedSetTypeVar", bound=list[Any])
 
+#: A string that will convert :py:class:`~cg:cryptography.x509.ObjectIdentifier` objects.
+#:
+#: This type alias will also validate the x509 dotted string format.
 OIDType = Annotated[str, BeforeValidator(oid_parser), AfterValidator(oid_validator)]
 
 UniqueTupleTypeVar = TypeVar("UniqueTupleTypeVar", bound=tuple[Hashable, ...])
diff --git a/ca/django_ca/pydantic/validators.py b/ca/django_ca/pydantic/validators.py
index 8b3a65832..a73a140e1 100644
--- a/ca/django_ca/pydantic/validators.py
+++ b/ca/django_ca/pydantic/validators.py
@@ -214,9 +214,9 @@ def serial_validator(value: str) -> str:
 
 
 def timedelta_as_number_parser(unit: Literal["seconds", "hours", "days"] = "seconds") -> Callable[[Any], Any]:
-    """Validator for timedeltas.
+    """Validator for ``timedelta``.
 
-    .. WARNING:: This validator differs in that it has to be called with a unit for timedeltas.
+    .. WARNING:: This validator differs in that it has to be called with a unit for ``timedeltas``.
     """
 
     def validator(value: Any) -> Any:
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 98c8a1984..ab561e012 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -468,6 +468,11 @@
     "basename": os.path.basename,
 }
 
+# Warnings
+suppress_warnings = [
+    "config.cache",  # jinja_filters has unpickable objects
+]
+
 qualname_overrides = {
     "_io.BytesIO": "python:io.BytesIO",
     "_io.StringIO": "python:io.StringIO",
@@ -500,7 +505,10 @@
 # Ignore (not so important) classes where the documented name does not match the documented name.
 nitpick_ignore = [
     ("py:class", "NoneType"),
+    ("py:class", "lambda"),
+    ("py:class", "locals>.<lambda"),
     # TypeVars for classes that make no sense in documenting.
+    ("py:class", "django_ca.pydantic.validators.T"),
     ("py:class", "django_ca.key_backends.base.CreatePrivateKeyOptionsTypeVar"),
     ("py:class", "django_ca.key_backends.base.StorePrivateKeyOptionsTypeVar"),
     ("py:class", "django_ca.key_backends.base.UsePrivateKeyOptionsTypeVar"),
diff --git a/docs/source/python/pydantic.rst b/docs/source/python/pydantic.rst
index b512a0155..fe92b901a 100644
--- a/docs/source/python/pydantic.rst
+++ b/docs/source/python/pydantic.rst
@@ -115,3 +115,10 @@ Models for CRL extensions are not currently used within the project itself.
 .. autoclass:: django_ca.pydantic.CRLNumberModel
 
 .. autoclass:: django_ca.pydantic.DeltaCRLIndicatorModel
+
+**********
+Validators
+**********
+
+.. automodule:: django_ca.pydantic.validators
+   :members:
diff --git a/requirements/requirements-dev-common.txt b/requirements/requirements-dev-common.txt
index cf59ddece..25b135a1a 100644
--- a/requirements/requirements-dev-common.txt
+++ b/requirements/requirements-dev-common.txt
@@ -2,7 +2,7 @@
 GitPython==3.1.43
 Jinja2==3.1.4
 PyYAML==6.0.2
-Sphinx==7.2.6
+Sphinx==7.3.7
 coverage[toml]==7.6.9
 django-test-migrations==1.4.0
 pytest==8.3.4