diff --git a/CHANGELOG.md b/CHANGELOG.md
index e58c4de31..913e5fe94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,24 @@ Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+## [2.40.0] - 2026-03-20
+
+### Added
+- **pi**: add Skill tool resolution (#1661)
+- health check phase 2 — real-time doctor issue visibility across widget, visualizer, and HTML reports (#1644)
+- upgrade forensics prompt to full-access GSD debugger (#1660)
+
+### Fixed
+- prune stale env-utils.js from extensions root, preventing startup load error (#1655)
+- **splash**: replace box corners with full-width bars for visual unity with auto-mode widget (#1654)
+- add runtime paths to forensics prompt to prevent path hallucination (#1657)
+- guard TUI render during session transitions to prevent freeze (#1658)
+- default UAT type to artifact-driven to prevent unnecessary auto-mode pauses (#1651)
+- cancel trailing async jobs on session switch to prevent wasted LLM turns (#1643)
+
+### Changed
+- decompose autoLoop into pipeline phases (#1615) (#1659)
+
 ## [2.39.0] - 2026-03-20
 
 ### Added
@@ -1475,7 +1493,8 @@ Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Changed
 - License updated to MIT
 
-[Unreleased]: https://github.com/gsd-build/gsd-2/compare/v2.39.0...HEAD
+[Unreleased]: https://github.com/gsd-build/gsd-2/compare/v2.40.0...HEAD
+[2.40.0]: https://github.com/gsd-build/gsd-2/compare/v2.39.0...v2.40.0
 [2.39.0]: https://github.com/gsd-build/gsd-2/compare/v2.38.0...v2.39.0
 [2.38.0]: https://github.com/gsd-build/gsd-2/compare/v2.37.1...v2.38.0
 [2.37.1]: https://github.com/gsd-build/gsd-2/compare/v2.37.0...v2.37.1
diff --git a/native/npm/darwin-arm64/package.json b/native/npm/darwin-arm64/package.json
index db9ffe909..ea5d06395 100644
--- a/native/npm/darwin-arm64/package.json
+++ b/native/npm/darwin-arm64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gsd-build/engine-darwin-arm64",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "GSD native engine binary for macOS ARM64",
   "os": [
     "darwin"
diff --git a/native/npm/darwin-x64/package.json b/native/npm/darwin-x64/package.json
index 7503db078..5a33ad60e 100644
--- a/native/npm/darwin-x64/package.json
+++ b/native/npm/darwin-x64/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gsd-build/engine-darwin-x64",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "GSD native engine binary for macOS Intel",
   "os": [
     "darwin"
diff --git a/native/npm/linux-arm64-gnu/package.json b/native/npm/linux-arm64-gnu/package.json
index 9d3ff3eb6..1f560d8c5 100644
--- a/native/npm/linux-arm64-gnu/package.json
+++ b/native/npm/linux-arm64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gsd-build/engine-linux-arm64-gnu",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "GSD native engine binary for Linux ARM64 (glibc)",
   "os": [
     "linux"
diff --git a/native/npm/linux-x64-gnu/package.json b/native/npm/linux-x64-gnu/package.json
index b3c0af80f..600f55808 100644
--- a/native/npm/linux-x64-gnu/package.json
+++ b/native/npm/linux-x64-gnu/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gsd-build/engine-linux-x64-gnu",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "GSD native engine binary for Linux x64 (glibc)",
   "os": [
     "linux"
diff --git a/native/npm/win32-x64-msvc/package.json b/native/npm/win32-x64-msvc/package.json
index 0cf1aa235..4847faba8 100644
--- a/native/npm/win32-x64-msvc/package.json
+++ b/native/npm/win32-x64-msvc/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gsd-build/engine-win32-x64-msvc",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "GSD native engine binary for Windows x64 (MSVC)",
   "os": [
     "win32"
diff --git a/package.json b/package.json
index 08659820a..7c7624ac2 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "gsd-pi",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "GSD — Get Shit Done coding agent",
   "license": "MIT",
   "repository": {
diff --git a/packages/pi-coding-agent/package.json b/packages/pi-coding-agent/package.json
index 7c2cc82ee..3e5615d7b 100644
--- a/packages/pi-coding-agent/package.json
+++ b/packages/pi-coding-agent/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@gsd/pi-coding-agent",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "description": "Coding agent CLI (vendored from pi-mono)",
   "type": "module",
   "piConfig": {
diff --git a/pkg/package.json b/pkg/package.json
index b6dee1207..82a9f7775 100644
--- a/pkg/package.json
+++ b/pkg/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@glittercowboy/gsd",
-  "version": "2.39.0",
+  "version": "2.40.0",
   "piConfig": {
     "name": "gsd",
     "configDir": ".gsd"