diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 0f02ea1..db3930f 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.39"
+  ".": "0.1.0-alpha.40"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0cf5c0..7eb42ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.1.0-alpha.40 (2024-12-17)
+
+Full Changelog: [v0.1.0-alpha.39...v0.1.0-alpha.40](https://github.com/openai/openai-go/compare/v0.1.0-alpha.39...v0.1.0-alpha.40)
+
+### Features
+
+* **api:** new o1 and GPT-4o models + preference fine-tuning ([#142](https://github.com/openai/openai-go/issues/142)) ([9207561](https://github.com/openai/openai-go/commit/920756111c0f7725eb5746b22c1393e327dc2990))
+
 ## 0.1.0-alpha.39 (2024-12-05)
 
 Full Changelog: [v0.1.0-alpha.38...v0.1.0-alpha.39](https://github.com/openai/openai-go/compare/v0.1.0-alpha.38...v0.1.0-alpha.39)
diff --git a/README.md b/README.md
index bc99e1d..2fcafa0 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ Or to pin the version:
 <!-- x-release-please-start-version -->
 
 ```sh
-go get -u 'github.com/openai/openai-go@v0.1.0-alpha.39'
+go get -u 'github.com/openai/openai-go@v0.1.0-alpha.40'
 ```
 
 <!-- x-release-please-end -->
diff --git a/internal/version.go b/internal/version.go
index 5c17998..bd47681 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -2,4 +2,4 @@
 
 package internal
 
-const PackageVersion = "0.1.0-alpha.39" // x-release-please-version
+const PackageVersion = "0.1.0-alpha.40" // x-release-please-version