diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 922af63..df40c4c 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,31 @@
 Changes
 =======
 
+0.33.0 (2024-03-29)
+-------------------
+
+Deprecation release. We've deprecated more public API, but made sure to provide/offer
+alternatives. This allows you to upgrade to newer versions of zgw-consumers already
+while buying yourself enough time to update your project code.
+
+We published some of the deprecated utilities in a separate package: ``zgw-consumers-oas``.
+
+* Deprecated the OAS test utilities in ``zgw_consumers.test``:
+
+    - ``read_schema``: Use ``zgw_consumers_oas.read_schema`` if you need to.
+    - ``generate_oas_component``: Use ``zgw_consumers_oas.generate_oas_component`` if
+      you need to. However, we recommend using `VCR`_ instead of manually
+      building API mocks, or leverage factory_boy_ to generate mock data.
+    - ``mock_service_oas_get``: there is no alternative because zgw-consumers no longer
+      fetches configured API schemas.
+
+* Deprecated ``zgw_consumers.drf.serializers.APIModelSerializer``. Instead, use
+  `djangorestframework-dataclasses`_.
+
+.. _VCR: https://vcrpy.readthedocs.io/en/latest/
+.. _factory_boy: https://factoryboy.readthedocs.io/en/stable/
+.. _djangorestframework-dataclasses: https://pypi.org/project/djangorestframework-dataclasses/
+
 0.32.0 (2024-03-26)
 -------------------
 
diff --git a/zgw_consumers/drf/serializers.py b/zgw_consumers/drf/serializers.py
index 45d399e..52a0f5f 100644
--- a/zgw_consumers/drf/serializers.py
+++ b/zgw_consumers/drf/serializers.py
@@ -14,10 +14,17 @@
 from uuid import UUID
 
 from rest_framework import fields, serializers
+from typing_extensions import deprecated
 
 from .utils import extract_model_field_type, get_field_kwargs
 
 
+@deprecated(
+    "The APIModelSerializer is deprecated and will be removed in 1.0. "
+    "The package `djangorestframework-dataclasses` seems to be a drop-in replacement.",
+    category=DeprecationWarning,
+    stacklevel=2,
+)
 class APIModelSerializer(serializers.Serializer):
     serializer_field_mapping = {
         str: fields.CharField,
diff --git a/zgw_consumers/test/component_generation.py b/zgw_consumers/test/component_generation.py
index da2f08e..244a58d 100644
--- a/zgw_consumers/test/component_generation.py
+++ b/zgw_consumers/test/component_generation.py
@@ -7,6 +7,7 @@
 
 import yaml
 from faker import Faker
+from typing_extensions import deprecated
 
 from .schema_mock import read_schema
 
@@ -20,6 +21,13 @@ def load_schema(service: str):
     return yaml.safe_load(read_schema(service))
 
 
+@deprecated(
+    "OAS (test) tooling is deprecated and scheduled for removal in 1.0. We recommend "
+    "writing your own factories, or alternatively `pip install zgw-consumers-oas` "
+    "for a drop-in replacement.",
+    category=DeprecationWarning,
+    stacklevel=2,
+)
 def generate_oas_component(
     service: str,
     component: str,
diff --git a/zgw_consumers/test/schema_mock.py b/zgw_consumers/test/schema_mock.py
index 17ed282..095af1c 100644
--- a/zgw_consumers/test/schema_mock.py
+++ b/zgw_consumers/test/schema_mock.py
@@ -8,6 +8,13 @@
 _cache = {}
 
 
+@deprecated(
+    "OAS (test) tooling is deprecated and scheduled for removal in 1.0. We recommend "
+    "writing your own factories, or alternatively `pip install zgw-consumers-oas` "
+    "for a drop-in replacement.",
+    category=DeprecationWarning,
+    stacklevel=2,
+)
 def read_schema(service: str, extension=".yaml"):
     schema_dirs = get_setting("ZGW_CONSUMERS_TEST_SCHEMA_DIRS")