diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index df3292ba..d6b94479 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.18.0"
+  ".": "3.18.1"
 }
\ No newline at end of file
diff --git a/.stats.yml b/.stats.yml
index d1b66331..f2253470 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,2 +1,4 @@
 configured_endpoints: 103
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/orb%2Forb-36a6db97756e8658369c9af3c0ac532ecacb032e5b8f6211094dcb4052943ff3.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/orb%2Forb-95a3d7780935a38e0cf076d4ad2d68bd1a5641bced8398d972db2e92751d364a.yml
+openapi_spec_hash: 9ebe818c4ad4f2d9c4e473b5192d7544
+config_hash: 3dc5bc1df028fc7301fb2ada9846f038
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a67df79f..8e8e1fd1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 3.18.1 (2025-04-02)
+
+Full Changelog: [v3.18.0...v3.18.1](https://github.com/orbcorp/orb-python/compare/v3.18.0...v3.18.1)
+
+### Chores
+
+* fix typos ([#606](https://github.com/orbcorp/orb-python/issues/606)) ([b6c691e](https://github.com/orbcorp/orb-python/commit/b6c691e84186bb62b295b5d1b01598691174eabe))
+* **internal:** minor test fixes ([#608](https://github.com/orbcorp/orb-python/issues/608)) ([7e79541](https://github.com/orbcorp/orb-python/commit/7e79541c498fdde340c4b52abac285bc5a89fd44))
+
 ## 3.18.0 (2025-03-20)
 
 Full Changelog: [v3.17.3...v3.18.0](https://github.com/orbcorp/orb-python/compare/v3.17.3...v3.18.0)
diff --git a/pyproject.toml b/pyproject.toml
index 77e5e52f..a5f1c748 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "orb-billing"
-version = "3.18.0"
+version = "3.18.1"
 description = "The official Python library for the orb API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/orb/_models.py b/src/orb/_models.py
index b51a1bf5..34935716 100644
--- a/src/orb/_models.py
+++ b/src/orb/_models.py
@@ -681,7 +681,7 @@ def set_pydantic_config(typ: Any, config: pydantic.ConfigDict) -> None:
     setattr(typ, "__pydantic_config__", config)  # noqa: B010
 
 
-# our use of subclasssing here causes weirdness for type checkers,
+# our use of subclassing here causes weirdness for type checkers,
 # so we just pretend that we don't subclass
 if TYPE_CHECKING:
     GenericModel = BaseModel
diff --git a/src/orb/_utils/_transform.py b/src/orb/_utils/_transform.py
index 18afd9d8..7ac2e17f 100644
--- a/src/orb/_utils/_transform.py
+++ b/src/orb/_utils/_transform.py
@@ -126,7 +126,7 @@ def _get_annotated_type(type_: type) -> type | None:
 def _maybe_transform_key(key: str, type_: type) -> str:
     """Transform the given `data` based on the annotations provided in `type_`.
 
-    Note: this function only looks at `Annotated` types that contain `PropertInfo` metadata.
+    Note: this function only looks at `Annotated` types that contain `PropertyInfo` metadata.
     """
     annotated_type = _get_annotated_type(type_)
     if annotated_type is None:
diff --git a/src/orb/_version.py b/src/orb/_version.py
index 9e68b0f5..07d04435 100644
--- a/src/orb/_version.py
+++ b/src/orb/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "orb"
-__version__ = "3.18.0"  # x-release-please-version
+__version__ = "3.18.1"  # x-release-please-version
diff --git a/tests/api_resources/plans/test_external_plan_id.py b/tests/api_resources/plans/test_external_plan_id.py
index a73b26ea..0adbc341 100644
--- a/tests/api_resources/plans/test_external_plan_id.py
+++ b/tests/api_resources/plans/test_external_plan_id.py
@@ -64,7 +64,6 @@ def test_path_params_update(self, client: Orb) -> None:
         ):
             client.plans.external_plan_id.with_raw_response.update(
                 other_external_plan_id="",
-                external_plan_id="",
             )
 
     @parametrize
@@ -156,7 +155,6 @@ async def test_path_params_update(self, async_client: AsyncOrb) -> None:
         ):
             await async_client.plans.external_plan_id.with_raw_response.update(
                 other_external_plan_id="",
-                external_plan_id="",
             )
 
     @parametrize
diff --git a/tests/api_resources/test_customers.py b/tests/api_resources/test_customers.py
index b5cf7ca7..fe2332c9 100644
--- a/tests/api_resources/test_customers.py
+++ b/tests/api_resources/test_customers.py
@@ -527,7 +527,6 @@ def test_path_params_update_by_external_id(self, client: Orb) -> None:
         with pytest.raises(ValueError, match=r"Expected a non-empty value for `id` but received ''"):
             client.customers.with_raw_response.update_by_external_id(
                 id="",
-                external_customer_id="",
             )
 
 
@@ -1052,5 +1051,4 @@ async def test_path_params_update_by_external_id(self, async_client: AsyncOrb) -
         with pytest.raises(ValueError, match=r"Expected a non-empty value for `id` but received ''"):
             await async_client.customers.with_raw_response.update_by_external_id(
                 id="",
-                external_customer_id="",
             )