diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6dc358e4..2b0c6a48 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.422.0"
+  ".": "0.423.0"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index ade5a460..6f42a9fe 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 227
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-9e8b4907003e0149ea10d8c95b2facfbc011f366cea40fe86b5f02940e68998d.yml
-openapi_spec_hash: e93ee5c48421038334b8961b303465d6
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/increase%2Fincrease-0281c1d774b1853b7b09bbce88b8d6e0301179b68d53627c5940edd7d2f8b180.yml
+openapi_spec_hash: e22a9d6a4f0f32976d0ac9dd7e6d7dd0
 config_hash: ca52ca9a2968f330339fd50c1a386e05
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29596cac..3b5da817 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.423.0 (2026-01-07)
+
+Full Changelog: [v0.422.0...v0.423.0](https://github.com/Increase/increase-python/compare/v0.422.0...v0.423.0)
+
+### Features
+
+* **api:** api update ([7700723](https://github.com/Increase/increase-python/commit/770072305586ae6b1fe9e6db0c4aea4515a36967))
+
 ## 0.422.0 (2026-01-07)
 
 Full Changelog: [v0.421.0...v0.422.0](https://github.com/Increase/increase-python/compare/v0.421.0...v0.422.0)
diff --git a/pyproject.toml b/pyproject.toml
index d3c55107..4e3009c1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "increase"
-version = "0.422.0"
+version = "0.423.0"
 description = "The official Python library for the increase API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/increase/_version.py b/src/increase/_version.py
index ea6c10c9..1a1e8d6a 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__ = "0.422.0"  # x-release-please-version
+__version__ = "0.423.0"  # x-release-please-version
diff --git a/src/increase/types/entity_update_params.py b/src/increase/types/entity_update_params.py
index 2036fd59..8c09fb43 100644
--- a/src/increase/types/entity_update_params.py
+++ b/src/increase/types/entity_update_params.py
@@ -116,6 +116,12 @@ class Corporation(TypedDict, total=False):
     Not every program requires an email for submitted Entities.
     """
 
+    incorporation_state: str
+    """
+    The two-letter United States Postal Service (USPS) abbreviation for the
+    corporation's state of incorporation.
+    """
+
     industry_code: str
     """
     The North American Industry Classification System (NAICS) code for the
diff --git a/tests/api_resources/test_entities.py b/tests/api_resources/test_entities.py
index be126246..f51067d0 100644
--- a/tests/api_resources/test_entities.py
+++ b/tests/api_resources/test_entities.py
@@ -364,6 +364,7 @@ def test_method_update_with_all_params(self, client: Increase) -> None:
                     "line2": "Unit 2",
                 },
                 "email": "dev@stainless.com",
+                "incorporation_state": "x",
                 "industry_code": "x",
                 "name": "x",
             },
@@ -1300,6 +1301,7 @@ async def test_method_update_with_all_params(self, async_client: AsyncIncrease)
                     "line2": "Unit 2",
                 },
                 "email": "dev@stainless.com",
+                "incorporation_state": "x",
                 "industry_code": "x",
                 "name": "x",
             },