diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index de0960ab..ffb929a0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.12.0"
+  ".": "1.12.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c872ed99..cf42097b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,15 @@
 # Changelog
 
+## 1.12.1 (2025-01-07)
+
+Full Changelog: [v1.12.0...v1.12.1](https://github.com/Finch-API/finch-api-python/compare/v1.12.0...v1.12.1)
+
+### Chores
+
+* add missing isclass check ([#556](https://github.com/Finch-API/finch-api-python/issues/556)) ([4b82e52](https://github.com/Finch-API/finch-api-python/commit/4b82e52af15f1f22f5b6e0212700ac301d0bc782))
+* **internal:** bump httpx dependency ([#557](https://github.com/Finch-API/finch-api-python/issues/557)) ([22b533f](https://github.com/Finch-API/finch-api-python/commit/22b533ff97e4931dfb5a71e1e2d783ab843d0115))
+* **internal:** codegen related update ([#554](https://github.com/Finch-API/finch-api-python/issues/554)) ([5db22d6](https://github.com/Finch-API/finch-api-python/commit/5db22d66a864bac7e7caeae7d3f168cbd2d76c0d))
+
 ## 1.12.0 (2024-12-17)
 
 Full Changelog: [v1.11.0...v1.12.0](https://github.com/Finch-API/finch-api-python/compare/v1.11.0...v1.12.0)
diff --git a/LICENSE b/LICENSE
index 1dac0f68..eee60015 100644
--- a/LICENSE
+++ b/LICENSE
@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2024 Finch
+   Copyright 2025 Finch
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
diff --git a/pyproject.toml b/pyproject.toml
index 6a53396d..87959353 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "finch-api"
-version = "1.12.0"
+version = "1.12.1"
 description = "The official Python library for the Finch API"
 dynamic = ["readme"]
 license = "Apache-2.0"
@@ -54,7 +54,7 @@ dev-dependencies = [
     "dirty-equals>=0.6.0",
     "importlib-metadata>=6.7.0",
     "rich>=13.7.1",
-    "nest_asyncio==1.6.0"
+    "nest_asyncio==1.6.0",
 ]
 
 [tool.rye.scripts]
diff --git a/requirements-dev.lock b/requirements-dev.lock
index 545f94f7..e07de0a7 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -35,7 +35,7 @@ h11==0.14.0
     # via httpcore
 httpcore==1.0.2
     # via httpx
-httpx==0.25.2
+httpx==0.28.1
     # via finch-api
     # via respx
 idna==3.4
@@ -76,7 +76,7 @@ python-dateutil==2.8.2
     # via time-machine
 pytz==2023.3.post1
     # via dirty-equals
-respx==0.20.2
+respx==0.22.0
 rich==13.7.1
 ruff==0.6.9
 setuptools==68.2.2
@@ -86,7 +86,6 @@ six==1.16.0
 sniffio==1.3.0
     # via anyio
     # via finch-api
-    # via httpx
 time-machine==2.9.0
 tomli==2.0.2
     # via mypy
diff --git a/requirements.lock b/requirements.lock
index ab955494..7d43b8d3 100644
--- a/requirements.lock
+++ b/requirements.lock
@@ -25,7 +25,7 @@ h11==0.14.0
     # via httpcore
 httpcore==1.0.2
     # via httpx
-httpx==0.25.2
+httpx==0.28.1
     # via finch-api
 idna==3.4
     # via anyio
@@ -37,7 +37,6 @@ pydantic-core==2.27.1
 sniffio==1.3.0
     # via anyio
     # via finch-api
-    # via httpx
 typing-extensions==4.12.2
     # via anyio
     # via finch-api
diff --git a/src/finch/_models.py b/src/finch/_models.py
index 7a547ce5..d56ea1d9 100644
--- a/src/finch/_models.py
+++ b/src/finch/_models.py
@@ -488,7 +488,11 @@ def construct_type(*, value: object, type_: object) -> object:
         _, items_type = get_args(type_)  # Dict[_, items_type]
         return {key: construct_type(value=item, type_=items_type) for key, item in value.items()}
 
-    if not is_literal_type(type_) and (issubclass(origin, BaseModel) or issubclass(origin, GenericModel)):
+    if (
+        not is_literal_type(type_)
+        and inspect.isclass(origin)
+        and (issubclass(origin, BaseModel) or issubclass(origin, GenericModel))
+    ):
         if is_list(value):
             return [cast(Any, type_).construct(**entry) if is_mapping(entry) else entry for entry in value]
 
diff --git a/src/finch/_version.py b/src/finch/_version.py
index 2ebb1bc5..0a6797c3 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__ = "1.12.0"  # x-release-please-version
+__version__ = "1.12.1"  # x-release-please-version
diff --git a/tests/test_client.py b/tests/test_client.py
index b43a181c..8ff4db44 100644
--- a/tests/test_client.py
+++ b/tests/test_client.py
@@ -17,6 +17,7 @@
 
 import httpx
 import pytest
+import packaging.version as version
 from respx import MockRouter
 from pydantic import ValidationError
 
@@ -643,6 +644,10 @@ def test_absolute_request_url(self, client: Finch) -> None:
         )
         assert request.url == "https://myapi.com/foo"
 
+    @pytest.mark.skipif(
+        version.parse(httpx.__version__) >= version.parse("0.28.0"),
+        reason="Test is only relevant for httpx versions < 0.28.0",
+    )
     def test_transport_option_is_deprecated(self) -> None:
         with pytest.warns(
             DeprecationWarning,
@@ -672,6 +677,10 @@ def test_transport_option_mutually_exclusive_with_http_client(self) -> None:
                         http_client=http_client,
                     )
 
+    @pytest.mark.skipif(
+        version.parse(httpx.__version__) >= version.parse("0.28.0"),
+        reason="Test is only relevant for httpx versions < 0.28.0",
+    )
     def test_connection_pool_limits_option_is_deprecated(self) -> None:
         with pytest.warns(
             DeprecationWarning,
@@ -709,6 +718,10 @@ def test_connection_pool_limits_option_mutually_exclusive_with_http_client(self)
                         http_client=http_client,
                     )
 
+    @pytest.mark.skipif(
+        version.parse(httpx.__version__) >= version.parse("0.28.0"),
+        reason="Test is only relevant for httpx versions < 0.28.0",
+    )
     def test_proxies_option_is_deprecated(self) -> None:
         with pytest.warns(
             DeprecationWarning,
@@ -1527,6 +1540,10 @@ def test_absolute_request_url(self, client: AsyncFinch) -> None:
         )
         assert request.url == "https://myapi.com/foo"
 
+    @pytest.mark.skipif(
+        version.parse(httpx.__version__) >= version.parse("0.28.0"),
+        reason="Test is only relevant for httpx versions < 0.28.0",
+    )
     def test_transport_option_is_deprecated(self) -> None:
         with pytest.warns(
             DeprecationWarning,
@@ -1556,6 +1573,10 @@ async def test_transport_option_mutually_exclusive_with_http_client(self) -> Non
                         http_client=http_client,
                     )
 
+    @pytest.mark.skipif(
+        version.parse(httpx.__version__) >= version.parse("0.28.0"),
+        reason="Test is only relevant for httpx versions < 0.28.0",
+    )
     def test_connection_pool_limits_option_is_deprecated(self) -> None:
         with pytest.warns(
             DeprecationWarning,
@@ -1593,6 +1614,10 @@ async def test_connection_pool_limits_option_mutually_exclusive_with_http_client
                         http_client=http_client,
                     )
 
+    @pytest.mark.skipif(
+        version.parse(httpx.__version__) >= version.parse("0.28.0"),
+        reason="Test is only relevant for httpx versions < 0.28.0",
+    )
     def test_proxies_option_is_deprecated(self) -> None:
         with pytest.warns(
             DeprecationWarning,