diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index bc86e4a2..418b49e9 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.38.0"
+  ".": "0.39.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2eabe5a8..cc88c742 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.39.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.38.0...v0.39.0) (2026-05-29)
+
+
+### Features
+
+* **deps:** update Claude Agent SDK to 0.3.156 ([#722](https://github.com/agentclientprotocol/claude-agent-acp/issues/722)) ([3fb6db4](https://github.com/agentclientprotocol/claude-agent-acp/commit/3fb6db4e5ee5bd1f431cf5d2ce5331ce983f9597))
+
 ## [0.38.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.37.0...v0.38.0) (2026-05-28)
 
 
diff --git a/package-lock.json b/package-lock.json
index 36dc95b6..189397cb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@agentclientprotocol/claude-agent-acp",
-  "version": "0.38.0",
+  "version": "0.39.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@agentclientprotocol/claude-agent-acp",
-      "version": "0.38.0",
+      "version": "0.39.0",
       "license": "Apache-2.0",
       "dependencies": {
         "@agentclientprotocol/sdk": "0.22.1",
diff --git a/package.json b/package.json
index e869a08d..d737de62 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "version": "0.38.0",
+  "version": "0.39.0",
   "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
   "main": "dist/lib.js",
   "types": "dist/lib.d.ts",