diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index c3c95522..2cd8f9bb 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.9.0"
+  ".": "1.9.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c7e5088..0daa6876 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## [1.9.1](https://github.com/googleapis/nodejs-vertexai/compare/v1.9.0...v1.9.1) (2024-10-25)
+
+
+### Bug Fixes
+
+* Add Context Cache support for ChatSessionPreview class ([#433](https://github.com/googleapis/nodejs-vertexai/issues/433)) ([df6f040](https://github.com/googleapis/nodejs-vertexai/commit/df6f0406fbaa72cd64a8f51015e51fee88518db8))
+* Add Context Cache support for ChatSessionPreview class ([#433](https://github.com/googleapis/nodejs-vertexai/issues/433)) ([a3beab1](https://github.com/googleapis/nodejs-vertexai/commit/a3beab1f30540749fbeba40a13327ea078dbed69))
+
+
+### Documentation
+
+* update README ([e9705cb](https://github.com/googleapis/nodejs-vertexai/commit/e9705cbd44154435a6ad32979e80005a8eef137d))
+* 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)
 
 
diff --git a/package.json b/package.json
index b3909837..44a3e1e9 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@google-cloud/vertexai",
   "description": "Vertex Generative AI client for Node.js",
-  "version": "1.9.0",
+  "version": "1.9.1",
   "license": "Apache-2.0",
   "author": "Google LLC",
   "engines": {
diff --git a/src/util/constants.ts b/src/util/constants.ts
index b06ae95f..b7673cf7 100644
--- a/src/util/constants.ts
+++ b/src/util/constants.ts
@@ -21,7 +21,7 @@ export const USER_ROLE = 'user';
 export const MODEL_ROLE = 'model';
 export const SYSTEM_ROLE = 'system';
 const USER_AGENT_PRODUCT = 'model-builder';
-const CLIENT_LIBRARY_VERSION = '1.9.0'; // x-release-please-version
+const CLIENT_LIBRARY_VERSION = '1.9.1'; // x-release-please-version
 const CLIENT_LIBRARY_LANGUAGE = `grpc-node/${CLIENT_LIBRARY_VERSION}`;
 export const USER_AGENT = `${USER_AGENT_PRODUCT}/${CLIENT_LIBRARY_VERSION} ${CLIENT_LIBRARY_LANGUAGE}`;
 export const CREDENTIAL_ERROR_MESSAGE =