diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index af99186b..eae5bf18 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.21.8"
+  ".": "0.21.9"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a51a0a96..45f042b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 0.21.9 (2024-07-10)
+
+Full Changelog: [v0.21.8...v0.21.9](https://github.com/Finch-API/finch-api-python/compare/v0.21.8...v0.21.9)
+
+### Chores
+
+* **internal:** add helper function ([#424](https://github.com/Finch-API/finch-api-python/issues/424)) ([a9a6206](https://github.com/Finch-API/finch-api-python/commit/a9a6206a74181a3d04fad5bcadf872c88ac4d13a))
+* **internal:** minor request options handling changes ([#422](https://github.com/Finch-API/finch-api-python/issues/422)) ([ed15e98](https://github.com/Finch-API/finch-api-python/commit/ed15e9847c8f2d5388526aa89847f5bed646e7bc))
+
 ## 0.21.8 (2024-07-03)
 
 Full Changelog: [v0.21.7...v0.21.8](https://github.com/Finch-API/finch-api-python/compare/v0.21.7...v0.21.8)
diff --git a/pyproject.toml b/pyproject.toml
index cfb93ba4..67664828 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "finch-api"
-version = "0.21.8"
+version = "0.21.9"
 description = "The official Python library for the Finch API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/finch/_base_client.py b/src/finch/_base_client.py
index accdccdc..2f20def3 100644
--- a/src/finch/_base_client.py
+++ b/src/finch/_base_client.py
@@ -956,6 +956,11 @@ def _request(
         stream: bool,
         stream_cls: type[_StreamT] | None,
     ) -> ResponseT | _StreamT:
+        # create a copy of the options we were given so that if the
+        # options are mutated later & we then retry, the retries are
+        # given the original options
+        input_options = model_copy(options)
+
         cast_to = self._maybe_override_cast_to(cast_to, options)
         self._prepare_options(options)
 
@@ -980,7 +985,7 @@ def _request(
 
             if retries > 0:
                 return self._retry_request(
-                    options,
+                    input_options,
                     cast_to,
                     retries,
                     stream=stream,
@@ -995,7 +1000,7 @@ def _request(
 
             if retries > 0:
                 return self._retry_request(
-                    options,
+                    input_options,
                     cast_to,
                     retries,
                     stream=stream,
@@ -1023,7 +1028,7 @@ def _request(
             if retries > 0 and self._should_retry(err.response):
                 err.response.close()
                 return self._retry_request(
-                    options,
+                    input_options,
                     cast_to,
                     retries,
                     err.response.headers,
@@ -1532,6 +1537,11 @@ async def _request(
             # execute it earlier while we are in an async context
             self._platform = await asyncify(get_platform)()
 
+        # create a copy of the options we were given so that if the
+        # options are mutated later & we then retry, the retries are
+        # given the original options
+        input_options = model_copy(options)
+
         cast_to = self._maybe_override_cast_to(cast_to, options)
         await self._prepare_options(options)
 
@@ -1554,7 +1564,7 @@ async def _request(
 
             if retries > 0:
                 return await self._retry_request(
-                    options,
+                    input_options,
                     cast_to,
                     retries,
                     stream=stream,
@@ -1569,7 +1579,7 @@ async def _request(
 
             if retries > 0:
                 return await self._retry_request(
-                    options,
+                    input_options,
                     cast_to,
                     retries,
                     stream=stream,
@@ -1592,7 +1602,7 @@ async def _request(
             if retries > 0 and self._should_retry(err.response):
                 await err.response.aclose()
                 return await self._retry_request(
-                    options,
+                    input_options,
                     cast_to,
                     retries,
                     err.response.headers,
diff --git a/src/finch/_models.py b/src/finch/_models.py
index 5d95bb4b..eb7ce3bd 100644
--- a/src/finch/_models.py
+++ b/src/finch/_models.py
@@ -643,6 +643,14 @@ def validate_type(*, type_: type[_T], value: object) -> _T:
     return cast(_T, _validate_non_model_type(type_=type_, value=value))
 
 
+def set_pydantic_config(typ: Any, config: pydantic.ConfigDict) -> None:
+    """Add a pydantic config for the given type.
+
+    Note: this is a no-op on Pydantic v1.
+    """
+    setattr(typ, "__pydantic_config__", config)  # noqa: B010
+
+
 # our use of subclasssing here causes weirdness for type checkers,
 # so we just pretend that we don't subclass
 if TYPE_CHECKING:
diff --git a/src/finch/_version.py b/src/finch/_version.py
index 7ab7e270..85c31c18 100644
--- a/src/finch/_version.py
+++ b/src/finch/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "finch"
-__version__ = "0.21.8"  # x-release-please-version
+__version__ = "0.21.9"  # x-release-please-version