diff --git a/manifest.json b/manifest.json
index fa92f7f..ba38a42 100644
--- a/manifest.json
+++ b/manifest.json
@@ -3,7 +3,7 @@
   "name": "browser.cpp",
   "short_name": "browser.cpp",
   "description": "In-browser C++20 IDE powered by Monaco Editor and WASM Clang",
-  "version": "0.4.10",
+  "version": "0.4.11",
   "minimum_chrome_version": "105",
   "icons": {
     "16": "icons/icon16.png",
diff --git a/package-lock.json b/package-lock.json
index af1bef7..ac9dd68 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "browser.cpp",
-  "version": "0.4.10",
+  "version": "0.4.11",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "browser.cpp",
-      "version": "0.4.10",
+      "version": "0.4.11",
       "dependencies": {
         "@xterm/addon-fit": "^0.11.0",
         "@xterm/addon-web-links": "^0.12.0",
diff --git a/package.json b/package.json
index 329d17e..a5404d6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "browser.cpp",
-  "version": "0.4.10",
+  "version": "0.4.11",
   "description": "In-browser C++20 IDE with WASM Clang toolchain",
   "private": true,
   "scripts": {
diff --git a/specs/issue-100-20260918-sdlc_planner-release-0.4.11.md b/specs/issue-100-20260918-sdlc_planner-release-0.4.11.md
new file mode 100644
index 0000000..1f1b638
--- /dev/null
+++ b/specs/issue-100-20260918-sdlc_planner-release-0.4.11.md
@@ -0,0 +1,19 @@
+# Release version 0.4.11
+
+## Goal
+
+Publish a reviewable release-candidate change that advances browser.cpp from
+`0.4.10` to `0.4.11`.
+
+## Plan
+
+1. Change the canonical version in `manifest.json` to `0.4.11`.
+2. Synchronize `package.json` and the root package metadata in
+   `package-lock.json` from the manifest.
+3. Verify version synchronization, linting, the E2E suite, and the production
+   build before submitting the pull request.
+
+## Scope
+
+Only release-version metadata and this planning record are changed. Generated
+build outputs and release artifacts are intentionally excluded.