diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6fd1cccb..e3201859 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,23 @@
 
 [1]: https://www.npmjs.com/package/@google-cloud/text-to-speech?activeTab=versions
 
+## [4.0.0](https://github.com/googleapis/nodejs-text-to-speech/compare/v3.4.0...v4.0.0) (2022-06-10)
+
+
+### ⚠ BREAKING CHANGES
+
+* update library to use Node 12 (#604)
+
+### Features
+
+* Consolidate task details into service API and add orchestration result details ([74f7cfb](https://github.com/googleapis/nodejs-text-to-speech/commit/74f7cfb6947c0b9b35dcddb9ede343877b4938a6))
+* promote CustomVoiceParams to v1 ([#591](https://github.com/googleapis/nodejs-text-to-speech/issues/591)) ([fe647dc](https://github.com/googleapis/nodejs-text-to-speech/commit/fe647dc8735792333e0203844279da6ada898e1a))
+
+
+### Build System
+
+* update library to use Node 12 ([#604](https://github.com/googleapis/nodejs-text-to-speech/issues/604)) ([4395d56](https://github.com/googleapis/nodejs-text-to-speech/commit/4395d5696205c257498d33693e53135da998ed38))
+
 ## [3.4.0](https://www.github.com/googleapis/nodejs-text-to-speech/compare/v3.3.1...v3.4.0) (2021-12-09)
 
 
diff --git a/package.json b/package.json
index f9681961..5d1edb55 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@google-cloud/text-to-speech",
   "description": "Cloud Text-to-Speech API client for Node.js",
-  "version": "3.4.0",
+  "version": "4.0.0",
   "license": "Apache-2.0",
   "author": "Google LLC",
   "engines": {
diff --git a/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json b/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json
index 6e369cea..dfdc0055 100644
--- a/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json
+++ b/samples/generated/v1/snippet_metadata.google.cloud.texttospeech.v1.json
@@ -1,7 +1,7 @@
 {
     "clientLibrary": {
         "name": "nodejs-texttospeech",
-        "version": "3.4.0",
+        "version": "4.0.0",
         "language": "TYPESCRIPT",
         "apis": [
             {
diff --git a/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json b/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json
index 333a599a..0b441813 100644
--- a/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json
+++ b/samples/generated/v1beta1/snippet_metadata.google.cloud.texttospeech.v1beta1.json
@@ -1,7 +1,7 @@
 {
     "clientLibrary": {
         "name": "nodejs-texttospeech",
-        "version": "3.4.0",
+        "version": "4.0.0",
         "language": "TYPESCRIPT",
         "apis": [
             {
diff --git a/samples/package.json b/samples/package.json
index 553ce699..1818f603 100644
--- a/samples/package.json
+++ b/samples/package.json
@@ -14,7 +14,7 @@
     "test": "mocha --timeout=60000"
   },
   "dependencies": {
-    "@google-cloud/text-to-speech": "^3.4.0",
+    "@google-cloud/text-to-speech": "^4.0.0",
     "yargs": "^16.0.0"
   },
   "devDependencies": {