diff --git a/CHANGELOG.md b/CHANGELOG.md
index 261ca80..85f67f0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,8 @@ Format based on [Keep a Changelog](https://keepachangelog.com/). Versioning foll
 
 ## [Unreleased]
 
+## [0.9.0] - 2026-09-27
+
 ### Added
 
 - **`setVoiceLanguage`** — agent code changes STT, TTS, or both for one live session, including the vendor (`sttVendor` / `ttsVendor`). `scope: "stt"` or `"tts"` leaves the other side in place. Spoken-language detection does not change either side until you call it. API keys stay in project secrets.
diff --git a/package-lock.json b/package-lock.json
index 4a6016b..0f8e3c5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@voicethere/agent",
-  "version": "0.8.3",
+  "version": "0.9.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@voicethere/agent",
-      "version": "0.8.3",
+      "version": "0.9.0",
       "license": "MIT",
       "dependencies": {
         "esbuild": "0.25.12"
diff --git a/package.json b/package.json
index bb7687b..ee04bc7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@voicethere/agent",
-  "version": "0.8.3",
+  "version": "0.9.0",
   "description": "VoiceThere customer agent SDK — IPC types and runtime helpers for sandboxed child bundles",
   "type": "module",
   "exports": {