diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1581ac3..3801ed6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,27 @@ All notable changes to `python-docs-mcp-server` are documented here.
 Format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/);
 this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.0] — Unreleased
+
+### Added
+
+- Added the seventh tool, `whatsnew_for_version`, for offline, read-only
+  discovery of indexed official Python release notes for an explicit version.
+  Filtered pagination preserves canonical sections, their order and fields,
+  and advances through matching sections without gaps. Returned sections have
+  nonempty excerpts; truncated excerpts include canonical `get_docs`
+  continuation instructions. A section that cannot fit with nonempty content
+  and its required canonical fields returns an explicit bounded error.
+  Successful responses are bounded to 20,000 Unicode characters in the model
+  JSON, not the MCP wire envelope.
+  ([#153](https://github.com/ayhammouda/python-docs-mcp-server/pull/153))
+
+### Changed
+
+- Aligned package and MCP Registry metadata to `0.4.0`. Canonical,
+  version-aware documentation queries remain offline and read-only;
+  distribution remains free under the MIT license.
+
 ## [0.3.2] — 2026-10-10
 
 ### Fixed
diff --git a/pyproject.toml b/pyproject.toml
index 4f85696..c8edba3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "python-docs-mcp-server"
-version = "0.3.2"
+version = "0.4.0"
 description = "The canonical Python stdlib oracle for AI coding agents — exact symbols, exact sections, exact versions, offline, always free, always MIT, token-frugal."
 readme = "README.md"
 license = "MIT"
diff --git a/server.json b/server.json
index 9016b32..9c060e7 100644
--- a/server.json
+++ b/server.json
@@ -8,13 +8,13 @@
     "url": "https://github.com/ayhammouda/python-docs-mcp-server",
     "source": "github"
   },
-  "version": "0.3.2",
+  "version": "0.4.0",
   "packages": [
     {
       "registryType": "pypi",
       "registryBaseUrl": "https://pypi.org",
       "identifier": "python-docs-mcp-server",
-      "version": "0.3.2",
+      "version": "0.4.0",
       "runtimeHint": "uvx",
       "transport": {
         "type": "stdio"
diff --git a/uv.lock b/uv.lock
index 3a32a8c..adc1c5f 100644
--- a/uv.lock
+++ b/uv.lock
@@ -544,7 +544,7 @@ wheels = [
 
 [[package]]
 name = "python-docs-mcp-server"
-version = "0.3.2"
+version = "0.4.0"
 source = { editable = "." }
 dependencies = [
     { name = "beautifulsoup4" },