diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d8b7cedc8a..dfb7e1cce2 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "3.42.1"
+  ".": "3.43.0"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a7a280034c..de57480c78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,14 @@
 # Changelog
 
+## [3.43.0](https://github.com/openai/openai-python/compare/v3.42.1...v3.43.0) (2026-11-02)
+
+
+### Features
+
+* **api:** expand Live Responses delegation tools ([#4233](https://github.com/openai/openai-python/issues/4233)) ([f6e8480](https://github.com/openai/openai-python/commit/f6e8480f9a5b2a4d02b17a1da54a1e57964bc312))
+* **responses:** accumulate rich WebSocket progress ([#4224](https://github.com/openai/openai-python/issues/4224)) ([48cdad3](https://github.com/openai/openai-python/commit/48cdad3a61321cf9a27834b818c6d1fcfe651138))
+* **responses:** add WebSocket lane overflow isolation ([#4225](https://github.com/openai/openai-python/issues/4225)) ([16bdad1](https://github.com/openai/openai-python/commit/16bdad17364b62254e14f52f834d15cf1036a024))
+
 ## [3.42.1](https://github.com/openai/openai-python/compare/v3.42.0...v3.42.1) (2026-11-01)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 69fd02f1dc..68688093e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "openai"
-version = "3.42.1"
+version = "3.43.0"
 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 90a6f5a74c..72a6b2a832 100644
--- a/src/openai/_version.py
+++ b/src/openai/_version.py
@@ -1,2 +1,2 @@
 __title__ = "openai"
-__version__ = "3.42.1"  # x-release-please-version
+__version__ = "3.43.0"  # x-release-please-version
diff --git a/uv.lock b/uv.lock
index 69d8f2c19f..999cf3e92b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1421,7 +1421,7 @@ wheels = [
 
 [[package]]
 name = "openai"
-version = "3.42.1" # x-release-please-version
+version = "3.43.0" # x-release-please-version
 source = { editable = "." }
 default-groups = ["dev", "pydantic-v2"]
 dependencies = [