diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index bd7f384..ca2c4e6 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.2.0"
+  ".": "4.2.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 02392b6..0d877c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## 4.2.1 (2025-12-16)
+
+Full Changelog: [v4.2.0...v4.2.1](https://github.com/runwayml/sdk-python/compare/v4.2.0...v4.2.1)
+
+### Bug Fixes
+
+* **types:** allow pyright to infer TypedDict types within SequenceNotStr ([9d4f77c](https://github.com/runwayml/sdk-python/commit/9d4f77c847837f20ef333a10e5a0d1d9e6a25cf5))
+
+
+### Chores
+
+* add missing docstrings ([4c14222](https://github.com/runwayml/sdk-python/commit/4c142226410821c794e9e3bf43c7bf9a7d5bf6c1))
+* **internal:** add missing files argument to base client ([1c5f3af](https://github.com/runwayml/sdk-python/commit/1c5f3af332fdd873865234b11c0b1b24aa9df688))
+
 ## 4.2.0 (2025-12-04)
 
 Full Changelog: [v4.1.1...v4.2.0](https://github.com/runwayml/sdk-python/compare/v4.1.1...v4.2.0)
diff --git a/pyproject.toml b/pyproject.toml
index 668ea2e..f31bdfb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "runwayml"
-version = "4.2.0"
+version = "4.2.1"
 description = "The official Python library for the runwayml API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/runwayml/_base_client.py b/src/runwayml/_base_client.py
index 8e9efd7..cc0bf65 100644
--- a/src/runwayml/_base_client.py
+++ b/src/runwayml/_base_client.py
@@ -1247,9 +1247,12 @@ def patch(
         *,
         cast_to: Type[ResponseT],
         body: Body | None = None,
+        files: RequestFiles | None = None,
         options: RequestOptions = {},
     ) -> ResponseT:
-        opts = FinalRequestOptions.construct(method="patch", url=path, json_data=body, **options)
+        opts = FinalRequestOptions.construct(
+            method="patch", url=path, json_data=body, files=to_httpx_files(files), **options
+        )
         return self.request(cast_to, opts)
 
     def put(
@@ -1767,9 +1770,12 @@ async def patch(
         *,
         cast_to: Type[ResponseT],
         body: Body | None = None,
+        files: RequestFiles | None = None,
         options: RequestOptions = {},
     ) -> ResponseT:
-        opts = FinalRequestOptions.construct(method="patch", url=path, json_data=body, **options)
+        opts = FinalRequestOptions.construct(
+            method="patch", url=path, json_data=body, files=to_httpx_files(files), **options
+        )
         return await self.request(cast_to, opts)
 
     async def put(
diff --git a/src/runwayml/_types.py b/src/runwayml/_types.py
index e845cd6..8facef4 100644
--- a/src/runwayml/_types.py
+++ b/src/runwayml/_types.py
@@ -243,6 +243,9 @@ class HttpxSendArgs(TypedDict, total=False):
 if TYPE_CHECKING:
     # This works because str.__contains__ does not accept object (either in typeshed or at runtime)
     # https://github.com/hauntsaninja/useful_types/blob/5e9710f3875107d068e7679fd7fec9cfab0eff3b/useful_types/__init__.py#L285
+    #
+    # Note: index() and count() methods are intentionally omitted to allow pyright to properly
+    # infer TypedDict types when dict literals are used in lists assigned to SequenceNotStr.
     class SequenceNotStr(Protocol[_T_co]):
         @overload
         def __getitem__(self, index: SupportsIndex, /) -> _T_co: ...
@@ -251,8 +254,6 @@ def __getitem__(self, index: slice, /) -> Sequence[_T_co]: ...
         def __contains__(self, value: object, /) -> bool: ...
         def __len__(self) -> int: ...
         def __iter__(self) -> Iterator[_T_co]: ...
-        def index(self, value: Any, start: int = 0, stop: int = ..., /) -> int: ...
-        def count(self, value: Any, /) -> int: ...
         def __reversed__(self) -> Iterator[_T_co]: ...
 else:
     # just point this to a normal `Sequence` at runtime to avoid having to special case
diff --git a/src/runwayml/_version.py b/src/runwayml/_version.py
index 9e0ccac..8b41e5d 100644
--- a/src/runwayml/_version.py
+++ b/src/runwayml/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "runwayml"
-__version__ = "4.2.0"  # x-release-please-version
+__version__ = "4.2.1"  # x-release-please-version
diff --git a/src/runwayml/types/character_performance_create_params.py b/src/runwayml/types/character_performance_create_params.py
index 8cc93cf..aa66adc 100644
--- a/src/runwayml/types/character_performance_create_params.py
+++ b/src/runwayml/types/character_performance_create_params.py
@@ -62,6 +62,11 @@ class CharacterPerformanceCreateParams(TypedDict, total=False):
 
 
 class CharacterImage(TypedDict, total=False):
+    """An image of your character.
+
+    In the output, the character will use the reference video performance in its original static environment.
+    """
+
     type: Required[Literal["image"]]
 
     uri: Required[str]
@@ -69,6 +74,11 @@ class CharacterImage(TypedDict, total=False):
 
 
 class CharacterVideo(TypedDict, total=False):
+    """A video of your character.
+
+    In the output, the character will use the reference video performance in its original animated environment and some of the character's own movements.
+    """
+
     type: Required[Literal["video"]]
 
     uri: Required[str]
@@ -79,6 +89,10 @@ class CharacterVideo(TypedDict, total=False):
 
 
 class Reference(TypedDict, total=False):
+    """
+    A video of a person performing in the manner that you would like your character to perform. The video must be between 3 and 30 seconds in duration.
+    """
+
     type: Required[Literal["video"]]
 
     uri: Required[str]
@@ -86,6 +100,8 @@ class Reference(TypedDict, total=False):
 
 
 class ContentModeration(TypedDict, total=False):
+    """Settings that affect the behavior of the content moderation system."""
+
     public_figure_threshold: Annotated[Literal["auto", "low"], PropertyInfo(alias="publicFigureThreshold")]
     """
     When set to `low`, the content moderation system will be less strict about
diff --git a/src/runwayml/types/image_to_video_create_params.py b/src/runwayml/types/image_to_video_create_params.py
index ecae04a..16ef9a0 100644
--- a/src/runwayml/types/image_to_video_create_params.py
+++ b/src/runwayml/types/image_to_video_create_params.py
@@ -68,6 +68,8 @@ class Gen4TurboPromptImagePromptImage(TypedDict, total=False):
 
 
 class Gen4TurboContentModeration(TypedDict, total=False):
+    """Settings that affect the behavior of the content moderation system."""
+
     public_figure_threshold: Annotated[Literal["auto", "low"], PropertyInfo(alias="publicFigureThreshold")]
     """
     When set to `low`, the content moderation system will be less strict about
@@ -160,6 +162,8 @@ class Gen3aTurboPromptImagePromptImage(TypedDict, total=False):
 
 
 class Gen3aTurboContentModeration(TypedDict, total=False):
+    """Settings that affect the behavior of the content moderation system."""
+
     public_figure_threshold: Annotated[Literal["auto", "low"], PropertyInfo(alias="publicFigureThreshold")]
     """
     When set to `low`, the content moderation system will be less strict about
diff --git a/src/runwayml/types/organization_retrieve_response.py b/src/runwayml/types/organization_retrieve_response.py
index f3a56ca..236bb0b 100644
--- a/src/runwayml/types/organization_retrieve_response.py
+++ b/src/runwayml/types/organization_retrieve_response.py
@@ -10,6 +10,8 @@
 
 
 class TierModels(BaseModel):
+    """Limits associated with the model."""
+
     max_concurrent_generations: int = FieldInfo(alias="maxConcurrentGenerations")
     """The maximum number of generations that can be run concurrently for this model."""
 
@@ -18,6 +20,8 @@ class TierModels(BaseModel):
 
 
 class Tier(BaseModel):
+    """Limits associated with the organization's tier."""
+
     max_monthly_credit_spend: int = FieldInfo(alias="maxMonthlyCreditSpend")
     """The maximum number of credits that can be purchased in a month."""
 
@@ -26,11 +30,15 @@ class Tier(BaseModel):
 
 
 class UsageModels(BaseModel):
+    """Usage data for the model."""
+
     daily_generations: int = FieldInfo(alias="dailyGenerations")
     """The number of generations that have been run for this model in the past day."""
 
 
 class Usage(BaseModel):
+    """Usage data for the organization."""
+
     models: Dict[str, UsageModels]
 
 
diff --git a/src/runwayml/types/speech_to_speech_create_params.py b/src/runwayml/types/speech_to_speech_create_params.py
index 50bda5f..18fc4db 100644
--- a/src/runwayml/types/speech_to_speech_create_params.py
+++ b/src/runwayml/types/speech_to_speech_create_params.py
@@ -24,6 +24,8 @@ class SpeechToSpeechCreateParams(TypedDict, total=False):
 
 
 class MediaAudio(TypedDict, total=False):
+    """An audio file containing dialogue to be processed."""
+
     type: Required[Literal["audio"]]
 
     uri: Required[str]
@@ -31,6 +33,8 @@ class MediaAudio(TypedDict, total=False):
 
 
 class MediaVideo(TypedDict, total=False):
+    """A video file containing dialogue to be processed."""
+
     type: Required[Literal["video"]]
 
     uri: Required[str]
@@ -41,6 +45,8 @@ class MediaVideo(TypedDict, total=False):
 
 
 class Voice(TypedDict, total=False):
+    """A voice preset from the RunwayML API."""
+
     preset_id: Required[
         Annotated[
             Literal[
diff --git a/src/runwayml/types/task_retrieve_response.py b/src/runwayml/types/task_retrieve_response.py
index 9284246..c6a2d91 100644
--- a/src/runwayml/types/task_retrieve_response.py
+++ b/src/runwayml/types/task_retrieve_response.py
@@ -13,6 +13,8 @@
 
 
 class Pending(BaseModel):
+    """A pending task"""
+
     id: str
     """The ID of the task being returned."""
 
@@ -23,6 +25,8 @@ class Pending(BaseModel):
 
 
 class Throttled(BaseModel):
+    """A throttled task"""
+
     id: str
     """The ID of the task being returned."""
 
@@ -33,6 +37,8 @@ class Throttled(BaseModel):
 
 
 class Cancelled(BaseModel):
+    """A cancelled or deleted task"""
+
     id: str
     """The ID of the task being returned."""
 
@@ -43,6 +49,8 @@ class Cancelled(BaseModel):
 
 
 class Running(BaseModel):
+    """A running task"""
+
     id: str
     """The ID of the task being returned."""
 
@@ -55,6 +63,8 @@ class Running(BaseModel):
 
 
 class Failed(BaseModel):
+    """A failed task"""
+
     id: str
     """The ID of the task being returned."""
 
@@ -77,6 +87,8 @@ class Failed(BaseModel):
 
 
 class Succeeded(BaseModel):
+    """A succeeded task"""
+
     id: str
     """The ID of the task being returned."""
 
diff --git a/src/runwayml/types/text_to_image_create_params.py b/src/runwayml/types/text_to_image_create_params.py
index 8a1e6c6..daaf399 100644
--- a/src/runwayml/types/text_to_image_create_params.py
+++ b/src/runwayml/types/text_to_image_create_params.py
@@ -81,6 +81,8 @@ class Gen4ImageTurboReferenceImage(TypedDict, total=False):
 
 
 class Gen4ImageTurboContentModeration(TypedDict, total=False):
+    """Settings that affect the behavior of the content moderation system."""
+
     public_figure_threshold: Annotated[Literal["auto", "low"], PropertyInfo(alias="publicFigureThreshold")]
     """
     When set to `low`, the content moderation system will be less strict about
@@ -138,6 +140,8 @@ class Gen4Image(TypedDict, total=False):
 
 
 class Gen4ImageContentModeration(TypedDict, total=False):
+    """Settings that affect the behavior of the content moderation system."""
+
     public_figure_threshold: Annotated[Literal["auto", "low"], PropertyInfo(alias="publicFigureThreshold")]
     """
     When set to `low`, the content moderation system will be less strict about
diff --git a/src/runwayml/types/text_to_speech_create_params.py b/src/runwayml/types/text_to_speech_create_params.py
index 7518af7..3940a85 100644
--- a/src/runwayml/types/text_to_speech_create_params.py
+++ b/src/runwayml/types/text_to_speech_create_params.py
@@ -23,6 +23,8 @@ class TextToSpeechCreateParams(TypedDict, total=False):
 
 
 class Voice(TypedDict, total=False):
+    """A voice preset from the RunwayML API."""
+
     preset_id: Required[
         Annotated[
             Literal[
diff --git a/src/runwayml/types/video_to_video_create_params.py b/src/runwayml/types/video_to_video_create_params.py
index b2cb513..56c5350 100644
--- a/src/runwayml/types/video_to_video_create_params.py
+++ b/src/runwayml/types/video_to_video_create_params.py
@@ -47,6 +47,8 @@ class VideoToVideoCreateParams(TypedDict, total=False):
 
 
 class ContentModeration(TypedDict, total=False):
+    """Settings that affect the behavior of the content moderation system."""
+
     public_figure_threshold: Annotated[Literal["auto", "low"], PropertyInfo(alias="publicFigureThreshold")]
     """
     When set to `low`, the content moderation system will be less strict about
@@ -55,6 +57,10 @@ class ContentModeration(TypedDict, total=False):
 
 
 class Reference(TypedDict, total=False):
+    """
+    Passing an image reference allows the model to emulate the style or content of the reference in the output.
+    """
+
     type: Required[Literal["image"]]
 
     uri: Required[str]