diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 71a38f2845..6603053537 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.74.0"
+  ".": "1.74.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90af38d900..b03bbedb52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## 1.74.1 (2025-04-16)
+
+Full Changelog: [v1.74.0...v1.74.1](https://github.com/openai/openai-python/compare/v1.74.0...v1.74.1)
+
+### Chores
+
+* **internal:** base client updates ([06303b5](https://github.com/openai/openai-python/commit/06303b501f8c17040c495971a4ee79ae340f6f4a))
+* **internal:** bump pyright version ([9fd1c77](https://github.com/openai/openai-python/commit/9fd1c778c3231616bf1331cb1daa86fdfca4cb7f))
+
 ## 1.74.0 (2025-04-14)
 
 Full Changelog: [v1.73.0...v1.74.0](https://github.com/openai/openai-python/compare/v1.73.0...v1.74.0)
diff --git a/pyproject.toml b/pyproject.toml
index eb07cd5ba7..e2cd25f69c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "1.74.0"
+version = "1.74.1"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
@@ -51,7 +51,7 @@ voice_helpers = ["sounddevice>=0.5.1", "numpy>=2.0.2"]
 managed = true
 # version pins are in requirements-dev.lock
 dev-dependencies = [
-    "pyright>=1.1.359",
+    "pyright==1.1.399",
     "mypy",
     "respx",
     "pytest",
diff --git a/requirements-dev.lock b/requirements-dev.lock
index 11bb5c1b30..9875a2b860 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -126,7 +126,7 @@ pygments==2.18.0
     # via rich
 pyjwt==2.8.0
     # via msal
-pyright==1.1.392.post0
+pyright==1.1.399
 pytest==8.3.3
     # via pytest-asyncio
 pytest-asyncio==0.24.0
diff --git a/src/openai/_base_client.py b/src/openai/_base_client.py
index 1dd3a4772c..8b43a20699 100644
--- a/src/openai/_base_client.py
+++ b/src/openai/_base_client.py
@@ -100,7 +100,11 @@
 _AsyncStreamT = TypeVar("_AsyncStreamT", bound=AsyncStream[Any])
 
 if TYPE_CHECKING:
-    from httpx._config import DEFAULT_TIMEOUT_CONFIG as HTTPX_DEFAULT_TIMEOUT
+    from httpx._config import (
+        DEFAULT_TIMEOUT_CONFIG,  # pyright: ignore[reportPrivateImportUsage]
+    )
+
+    HTTPX_DEFAULT_TIMEOUT = DEFAULT_TIMEOUT_CONFIG
 else:
     try:
         from httpx._config import DEFAULT_TIMEOUT_CONFIG as HTTPX_DEFAULT_TIMEOUT
@@ -117,6 +121,7 @@ class PageInfo:
 
     url: URL | NotGiven
     params: Query | NotGiven
+    json: Body | NotGiven
 
     @overload
     def __init__(
@@ -132,19 +137,30 @@ def __init__(
         params: Query,
     ) -> None: ...
 
+    @overload
+    def __init__(
+        self,
+        *,
+        json: Body,
+    ) -> None: ...
+
     def __init__(
         self,
         *,
         url: URL | NotGiven = NOT_GIVEN,
+        json: Body | NotGiven = NOT_GIVEN,
         params: Query | NotGiven = NOT_GIVEN,
     ) -> None:
         self.url = url
+        self.json = json
         self.params = params
 
     @override
     def __repr__(self) -> str:
         if self.url:
             return f"{self.__class__.__name__}(url={self.url})"
+        if self.json:
+            return f"{self.__class__.__name__}(json={self.json})"
         return f"{self.__class__.__name__}(params={self.params})"
 
 
@@ -193,6 +209,19 @@ def _info_to_options(self, info: PageInfo) -> FinalRequestOptions:
             options.url = str(url)
             return options
 
+        if not isinstance(info.json, NotGiven):
+            if not is_mapping(info.json):
+                raise TypeError("Pagination is only supported with mappings")
+
+            if not options.json_data:
+                options.json_data = {**info.json}
+            else:
+                if not is_mapping(options.json_data):
+                    raise TypeError("Pagination is only supported with mappings")
+
+                options.json_data = {**options.json_data, **info.json}
+            return options
+
         raise ValueError("Unexpected PageInfo state")
 
 
diff --git a/src/openai/_models.py b/src/openai/_models.py
index fc4f201e4e..9b1aeb30bf 100644
--- a/src/openai/_models.py
+++ b/src/openai/_models.py
@@ -20,7 +20,6 @@
 )
 
 import pydantic
-import pydantic.generics
 from pydantic.fields import FieldInfo
 
 from ._types import (
diff --git a/src/openai/_utils/_typing.py b/src/openai/_utils/_typing.py
index 1958820f8d..1bac9542e2 100644
--- a/src/openai/_utils/_typing.py
+++ b/src/openai/_utils/_typing.py
@@ -110,7 +110,7 @@ class MyResponse(Foo[_T]):
     ```
     """
     cls = cast(object, get_origin(typ) or typ)
-    if cls in generic_bases:
+    if cls in generic_bases:  # pyright: ignore[reportUnnecessaryContains]
         # we're given the class directly
         return extract_type_arg(typ, index)
 
diff --git a/src/openai/_version.py b/src/openai/_version.py
index b203ed859f..5bbfee3232 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "openai"
-__version__ = "1.74.0"  # x-release-please-version
+__version__ = "1.74.1"  # x-release-please-version
diff --git a/tests/conftest.py b/tests/conftest.py
index fa82d39d86..8b01753e2f 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -10,7 +10,7 @@
 from openai import OpenAI, AsyncOpenAI
 
 if TYPE_CHECKING:
-    from _pytest.fixtures import FixtureRequest
+    from _pytest.fixtures import FixtureRequest  # pyright: ignore[reportPrivateImportUsage]
 
 pytest.register_assert_rewrite("tests.utils")
 
diff --git a/tests/test_models.py b/tests/test_models.py
index b9be1f3ea3..4b18940b49 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -832,7 +832,7 @@ class B(BaseModel):
 
 @pytest.mark.skipif(not PYDANTIC_V2, reason="TypeAliasType is not supported in Pydantic v1")
 def test_type_alias_type() -> None:
-    Alias = TypeAliasType("Alias", str)
+    Alias = TypeAliasType("Alias", str)  # pyright: ignore
 
     class Model(BaseModel):
         alias: Alias