diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index caa6bf0..96e1bc4 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.2.0-alpha.8"
+  ".": "0.2.0-alpha.9"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 90a382d..673e82d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.2.0-alpha.9 (2024-12-25)
+
+Full Changelog: [v0.2.0-alpha.8...v0.2.0-alpha.9](https://github.com/anthropics/anthropic-sdk-go/compare/v0.2.0-alpha.8...v0.2.0-alpha.9)
+
+### Features
+
+* **api:** add message batch delete endpoint ([#81](https://github.com/anthropics/anthropic-sdk-go/issues/81)) ([b3a63e7](https://github.com/anthropics/anthropic-sdk-go/commit/b3a63e7cbf73d06141750cf126af25412b12061d))
+
 ## 0.2.0-alpha.8 (2024-12-19)
 
 Full Changelog: [v0.2.0-alpha.7...v0.2.0-alpha.8](https://github.com/anthropics/anthropic-sdk-go/compare/v0.2.0-alpha.7...v0.2.0-alpha.8)
diff --git a/README.md b/README.md
index 5fe3da5..08ca7d3 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/anthropics/anthropic-sdk-go@v0.2.0-alpha.8'
+go get -u 'github.com/anthropics/anthropic-sdk-go@v0.2.0-alpha.9'
 ```
 
 <!-- x-release-please-end -->