diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index e9cee8d37..ba48addfa 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.195.0"
+  ".": "0.196.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index 965dafe41..43048b318 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,2 @@
 configured_endpoints: 201
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-5c3b5c54f9deac8411f40a4a8e14715ed60acd2ae56c5e36e83664586ef5aafd.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-d4eedf5add319b076d462be8b764246f0c3251ff60708906a90494e05ed8e93c.yml
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90c250671..b27cf236d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## 0.196.0 (2025-02-26)
+
+Full Changelog: [v0.195.0...v0.196.0](https://github.com/Increase/increase-python/compare/v0.195.0...v0.196.0)
+
+### Features
+
+* **api:** api update ([#985](https://github.com/Increase/increase-python/issues/985)) ([81f6b10](https://github.com/Increase/increase-python/commit/81f6b105c54e0c4819f2b73796d4c9732f0eff78))
+
+
+### Chores
+
+* **internal:** properly set __pydantic_private__ ([#983](https://github.com/Increase/increase-python/issues/983)) ([205e301](https://github.com/Increase/increase-python/commit/205e301b786c31f8d1e3bdfdfcbe7b396f53c743))
+
 ## 0.195.0 (2025-02-24)
 
 Full Changelog: [v0.194.0...v0.195.0](https://github.com/Increase/increase-python/compare/v0.194.0...v0.195.0)
diff --git a/pyproject.toml b/pyproject.toml
index 6a4c34d02..82d6a30ef 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "increase"
-version = "0.195.0"
+version = "0.196.0"
 description = "The official Python library for the increase API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/increase/_base_client.py b/src/increase/_base_client.py
index 978d684f1..67dc8a43d 100644
--- a/src/increase/_base_client.py
+++ b/src/increase/_base_client.py
@@ -63,7 +63,7 @@
     ModelBuilderProtocol,
 )
 from ._utils import is_dict, is_list, asyncify, is_given, lru_cache, is_mapping
-from ._compat import model_copy, model_dump
+from ._compat import PYDANTIC_V2, model_copy, model_dump
 from ._models import GenericModel, FinalRequestOptions, validate_type, construct_type
 from ._response import (
     APIResponse,
@@ -207,6 +207,9 @@ def _set_private_attributes(
         model: Type[_T],
         options: FinalRequestOptions,
     ) -> None:
+        if PYDANTIC_V2 and getattr(self, "__pydantic_private__", None) is None:
+            self.__pydantic_private__ = {}
+
         self._model = model
         self._client = client
         self._options = options
@@ -292,6 +295,9 @@ def _set_private_attributes(
         client: AsyncAPIClient,
         options: FinalRequestOptions,
     ) -> None:
+        if PYDANTIC_V2 and getattr(self, "__pydantic_private__", None) is None:
+            self.__pydantic_private__ = {}
+
         self._model = model
         self._client = client
         self._options = options
diff --git a/src/increase/_version.py b/src/increase/_version.py
index 2169af86d..7c542a20e 100644
--- a/src/increase/_version.py
+++ b/src/increase/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "increase"
-__version__ = "0.195.0"  # x-release-please-version
+__version__ = "0.196.0"  # x-release-please-version
diff --git a/tests/api_resources/test_event_subscriptions.py b/tests/api_resources/test_event_subscriptions.py
index 877e24f0f..b2edc3d62 100644
--- a/tests/api_resources/test_event_subscriptions.py
+++ b/tests/api_resources/test_event_subscriptions.py
@@ -31,7 +31,7 @@ def test_method_create(self, client: Increase) -> None:
     def test_method_create_with_all_params(self, client: Increase) -> None:
         event_subscription = client.event_subscriptions.create(
             url="https://website.com/webhooks",
-            oauth_connection_id="oauth_connection_id",
+            oauth_connection_id="x",
             selected_event_category="account.created",
             shared_secret="x",
         )
@@ -194,7 +194,7 @@ async def test_method_create(self, async_client: AsyncIncrease) -> None:
     async def test_method_create_with_all_params(self, async_client: AsyncIncrease) -> None:
         event_subscription = await async_client.event_subscriptions.create(
             url="https://website.com/webhooks",
-            oauth_connection_id="oauth_connection_id",
+            oauth_connection_id="x",
             selected_event_category="account.created",
             shared_secret="x",
         )