diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 954743f6..2e534d65 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.79.0"
+  ".": "0.80.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb77c8a0..f26f8940 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.80.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.79.0...v0.80.0) (2026-09-22)
+
+
+### Features
+
+* **deps:** Bump claude-agent-sdk to 0.3.278 ([#1147](https://github.com/agentclientprotocol/claude-agent-acp/issues/1147)) ([5bc3b4e](https://github.com/agentclientprotocol/claude-agent-acp/commit/5bc3b4e5609c7e4290fa1bca50c30c7340de6bbf))
+
+
+### Bug Fixes
+
+* close interrupted compaction lifecycles ([#1154](https://github.com/agentclientprotocol/claude-agent-acp/issues/1154)) ([a05aca6](https://github.com/agentclientprotocol/claude-agent-acp/commit/a05aca6b81bfd172ab47064dd21e835da95fc72b))
+* prefer terminal output deltas ([#1150](https://github.com/agentclientprotocol/claude-agent-acp/issues/1150)) ([c6f9668](https://github.com/agentclientprotocol/claude-agent-acp/commit/c6f9668c1234b43888bc44aaf63daf8be1a745e2))
+
 ## [0.79.0](https://github.com/agentclientprotocol/claude-agent-acp/compare/v0.78.0...v0.79.0) (2026-09-17)
 
 
diff --git a/package-lock.json b/package-lock.json
index 9dd9a885..76bc9fcc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@agentclientprotocol/claude-agent-acp",
-  "version": "0.79.0",
+  "version": "0.80.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@agentclientprotocol/claude-agent-acp",
-      "version": "0.79.0",
+      "version": "0.80.0",
       "license": "Apache-2.0",
       "dependencies": {
         "@agentclientprotocol/sdk": "1.5.0",
diff --git a/package.json b/package.json
index b9bcd823..fcee4ff3 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "publishConfig": {
     "access": "public"
   },
-  "version": "0.79.0",
+  "version": "0.80.0",
   "description": "An ACP-compatible coding agent powered by the Claude Agent SDK (TypeScript)",
   "main": "dist/lib.js",
   "types": "dist/lib.d.ts",