diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 0a40b9d7..f6592787 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.40.0"
+  ".": "0.40.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eced9b61..be2eab4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,16 @@
 # Changelog
 
+## 0.40.1 (2024-12-09)
+
+Full Changelog: [v0.40.0...v0.40.1](https://github.com/anthropics/anthropic-sdk-python/compare/v0.40.0...v0.40.1)
+
+### Chores
+
+* **internal:** bump pydantic dependency ([#775](https://github.com/anthropics/anthropic-sdk-python/issues/775)) ([99b4d06](https://github.com/anthropics/anthropic-sdk-python/commit/99b4d06e73cdae3f2c97c304b8c0b64ec4758768))
+* **internal:** bump pyright ([#769](https://github.com/anthropics/anthropic-sdk-python/issues/769)) ([81f7d70](https://github.com/anthropics/anthropic-sdk-python/commit/81f7d70fa85029f86de30ac1701ec39d01dde8f9))
+* make the `Omit` type public ([#772](https://github.com/anthropics/anthropic-sdk-python/issues/772)) ([4ed0419](https://github.com/anthropics/anthropic-sdk-python/commit/4ed041961b59a7943b00a8e592ead0e962f36174))
+* remove deprecated HTTP client options ([#777](https://github.com/anthropics/anthropic-sdk-python/issues/777)) ([3933368](https://github.com/anthropics/anthropic-sdk-python/commit/3933368e8a54d1f81c9503576e461c3d75292c39))
+
 ## 0.40.0 (2024-11-28)
 
 Full Changelog: [v0.39.0...v0.40.0](https://github.com/anthropics/anthropic-sdk-python/compare/v0.39.0...v0.40.0)
diff --git a/pyproject.toml b/pyproject.toml
index e411b281..163610ad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "anthropic"
-version = "0.40.0"
+version = "0.40.1"
 description = "The official Python library for the anthropic API"
 dynamic = ["readme"]
 license = "MIT"
diff --git a/src/anthropic/_version.py b/src/anthropic/_version.py
index a87bfc50..02855b4f 100644
--- a/src/anthropic/_version.py
+++ b/src/anthropic/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "anthropic"
-__version__ = "0.40.0"  # x-release-please-version
+__version__ = "0.40.1"  # x-release-please-version