diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c7e5088..0e16d504 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [1.9.1](https://github.com/googleapis/nodejs-vertexai/compare/v1.9.0...v1.9.1) (2024-10-23)
+
+
+### Bug Fixes
+
+* extend UsageMetadata interface ([#439](https://github.com/googleapis/nodejs-vertexai/issues/439))
+
+
+### Documentation
+
+* update README ([a052132](https://github.com/googleapis/nodejs-vertexai/commit/a052132b91bad5ee9a42c6fe2057afceab36b542))
+
 ## [1.9.0](https://github.com/googleapis/nodejs-vertexai/compare/v1.8.1...v1.9.0) (2024-10-14)