diff --git a/requirements-dev.lock b/requirements-dev.lock
index f09dc70f..11da837e 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -85,9 +85,9 @@ pyasn1==0.6.1
     # via rsa
 pyasn1-modules==0.4.1
     # via google-auth
-pydantic==2.9.2
+pydantic==2.10.3
     # via anthropic
-pydantic-core==2.23.4
+pydantic-core==2.27.1
     # via pydantic
 pygments==2.18.0
     # via rich
@@ -130,6 +130,7 @@ typing-extensions==4.12.2
     # via mypy
     # via pydantic
     # via pydantic-core
+    # via pyright
 urllib3==1.26.20
     # via botocore
 virtualenv==20.24.5
diff --git a/requirements.lock b/requirements.lock
index f8ed8f88..710c6e61 100644
--- a/requirements.lock
+++ b/requirements.lock
@@ -50,9 +50,9 @@ pyasn1==0.6.1
     # via rsa
 pyasn1-modules==0.4.1
     # via google-auth
-pydantic==2.9.2
+pydantic==2.10.3
     # via anthropic
-pydantic-core==2.23.4
+pydantic-core==2.27.1
     # via pydantic
 python-dateutil==2.9.0.post0
     # via botocore
diff --git a/src/anthropic/_types.py b/src/anthropic/_types.py
index fd6f305a..d80c2081 100644
--- a/src/anthropic/_types.py
+++ b/src/anthropic/_types.py
@@ -194,10 +194,8 @@ def get(self, __key: str) -> str | None: ...
 StrBytesIntFloat = Union[str, bytes, int, float]
 
 # Note: copied from Pydantic
-# https://github.com/pydantic/pydantic/blob/32ea570bf96e84234d2992e1ddf40ab8a565925a/pydantic/main.py#L49
-IncEx: TypeAlias = Union[
-    Set[int], Set[str], Mapping[int, Union["IncEx", Literal[True]]], Mapping[str, Union["IncEx", Literal[True]]]
-]
+# https://github.com/pydantic/pydantic/blob/6f31f8f68ef011f84357330186f603ff295312fd/pydantic/main.py#L79
+IncEx: TypeAlias = Union[Set[int], Set[str], Mapping[int, Union["IncEx", bool]], Mapping[str, Union["IncEx", bool]]]
 
 PostParser = Callable[[Any], Any]