diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 969a63da..b7e1f866 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.84.0"
+  ".": "0.85.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e3885d4..8cbc9a04 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.85.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.84.0...v0.85.0) (2026-10-01)
+
+
+### Features
+
+* **deps:** Bump @anthropic-ai/claude-agent-sdk to 0.3.286 ([#1211](https://github.com/agentclientprotocol/claude-agent-acp/issues/1211)) ([f53b0d7](https://github.com/agentclientprotocol/claude-agent-acp/commit/f53b0d7f40bcd0e9bddace85f123ff4851afcb1f))
+
+
+### Bug Fixes
+
+* Adapt to SDK 0.3.284 replay and ultracode changes ([#1208](https://github.com/agentclientprotocol/claude-agent-acp/issues/1208)) ([4af8079](https://github.com/agentclientprotocol/claude-agent-acp/commit/4af807968c7f0813bcb20fe2bcab2370320e9074))
+* send the legacy custom answer key to AIR ([#1210](https://github.com/agentclientprotocol/claude-agent-acp/issues/1210)) ([af0b43d](https://github.com/agentclientprotocol/claude-agent-acp/commit/af0b43de944e36f81343f40b7aa1a96cd48c3218))
+
 ## [0.84.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.83.0...v0.84.0) (2026-09-28)
 
 
diff --git a/package-lock.json b/package-lock.json
index d25d8f45..ac7c910c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@agentclientprotocol/claude-agent-acp",
-  "version": "0.84.0",
+  "version": "0.85.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@agentclientprotocol/claude-agent-acp",
-      "version": "0.84.0",
+      "version": "0.85.0",
       "license": "Apache-2.0",
       "dependencies": {
         "@agentclientprotocol/sdk": "1.5.1",
diff --git a/package.json b/package.json
index 0ac65f89..1e1f91a0 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "version": "0.84.0",
+  "version": "0.85.0",
   "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
   "main": "dist/lib.js",
   "types": "dist/lib.d.ts",