diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index b56c3d0..e8285b7 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.4"
+  ".": "0.1.0-alpha.5"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d5ef35..964af11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.1.0-alpha.5 (2024-08-12)
+
+Full Changelog: [v0.1.0-alpha.4...v0.1.0-alpha.5](https://github.com/openai/openai-go/compare/v0.1.0-alpha.4...v0.1.0-alpha.5)
+
+### Features
+
+* simplify content union ([#18](https://github.com/openai/openai-go/issues/18)) ([51877bf](https://github.com/openai/openai-go/commit/51877bf8f16e348a531aa54f0f49e9d71390a485))
+
 ## 0.1.0-alpha.4 (2024-08-12)
 
 Full Changelog: [v0.1.0-alpha.3...v0.1.0-alpha.4](https://github.com/openai/openai-go/compare/v0.1.0-alpha.3...v0.1.0-alpha.4)
diff --git a/README.md b/README.md
index 8c1d84b..1435efc 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Or to pin the version:
 <!-- x-release-please-start-version -->
 
 ```sh
-go get -u 'github.com/openai/openai-go@v0.1.0-alpha.4'
+go get -u 'github.com/openai/openai-go@v0.1.0-alpha.5'
 ```
 
 <!-- x-release-please-end -->
diff --git a/internal/version.go b/internal/version.go
index 5469df6..2aad167 100644
--- a/internal/version.go
+++ b/internal/version.go
@@ -2,4 +2,4 @@
 
 package internal
 
-const PackageVersion = "0.1.0-alpha.4" // x-release-please-version
+const PackageVersion = "0.1.0-alpha.5" // x-release-please-version