diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b6bbe1cc1b..a00871bae4 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.39.0"
+  ".": "3.40.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 75c8d227bb..ae1f01ab75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,29 @@
 # Changelog
 
+## [3.40.0](https://github.com/openai/openai-python/compare/v3.39.0...v3.40.0) (2026-10-27)
+
+
+### Features
+
+* **api:** add prompt cache breakpoint TTL options ([#4188](https://github.com/openai/openai-python/issues/4188)) ([3596d18](https://github.com/openai/openai-python/commit/3596d18f05b63081fd64c6da82b515293afb98c6))
+
+
+### Bug Fixes
+
+* **ci:** use an explicit browser demo dependency ([#4185](https://github.com/openai/openai-python/issues/4185)) ([a3f4302](https://github.com/openai/openai-python/commit/a3f430241c4a2e3e25bf79cc7d0148e51795a292))
+
+
+### Chores
+
+* **api:** record completed generated-code separation ([#4190](https://github.com/openai/openai-python/issues/4190)) ([d7ab5ee](https://github.com/openai/openai-python/commit/d7ab5ee237f8d8a8fa51dd7177a47cfbd6c331e6))
+* **deps-dev:** bump griffe from 1.14.0 to 2.3.0 ([#4069](https://github.com/openai/openai-python/issues/4069)) ([766b849](https://github.com/openai/openai-python/commit/766b849c2a32f47d7a0299c919fd10dd2fec7c6d))
+* **deps:** bump actions/create-github-app-token from 3.2.0 to 3.3.0 ([#4178](https://github.com/openai/openai-python/issues/4178)) ([06dbb5d](https://github.com/openai/openai-python/commit/06dbb5d019d7b6870b5898bf5df579ca60b61d28))
+* **deps:** bump actions/download-artifact from 8.0.1 to 8.0.2 ([#4110](https://github.com/openai/openai-python/issues/4110)) ([2404d04](https://github.com/openai/openai-python/commit/2404d0453d8f8dea27b09871359dd7d36510c21b))
+* **deps:** bump actions/upload-artifact from 7.0.1 to 7.0.2 ([#4107](https://github.com/openai/openai-python/issues/4107)) ([0adf711](https://github.com/openai/openai-python/commit/0adf71130c1ad0fec62af9ed4589e5961c48fcea))
+* **deps:** bump github/codeql-action/analyze from 4.38.2 to 4.39.0 ([#4177](https://github.com/openai/openai-python/issues/4177)) ([1e42321](https://github.com/openai/openai-python/commit/1e423213f13024df53e75eb500c8b8ab6277d5cc))
+* **deps:** bump openai/codex-action from 1.12 to 1.13 ([#4070](https://github.com/openai/openai-python/issues/4070)) ([904ed3f](https://github.com/openai/openai-python/commit/904ed3f6ba0f2351af67c9456e9f020401a8a7f8))
+* update generated-code verification and preserve SDK helpers ([#4186](https://github.com/openai/openai-python/issues/4186)) ([9412200](https://github.com/openai/openai-python/commit/9412200f9d2d25201e8ad007a6da198e395853c8))
+
 ## [3.39.0](https://github.com/openai/openai-python/compare/v3.38.0...v3.39.0) (2026-10-26)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 564175aca0..6b20739732 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "3.39.0"
+version = "3.40.0"
 description = "The official Python library for the openai API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/openai/_version.py b/src/openai/_version.py
index 3907d0929f..4f302307f8 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,2 +1,2 @@
 __title__ = "openai"
-__version__ = "3.39.0"  # x-release-please-version
+__version__ = "3.40.0"  # x-release-please-version
diff --git a/uv.lock b/uv.lock
index 0b735c702d..f18af84943 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1691,7 +1691,7 @@ wheels = [
 
 [[package]]
 name = "openai"
-version = "3.39.0" # x-release-please-version
+version = "3.40.0" # x-release-please-version
 source = { editable = "." }
 default-groups = ["dev", "pydantic-v2"]
 dependencies = [