diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a310e9..7ebd297 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,22 @@ All notable changes to this project will be documented in this file.
 Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 Project uses [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.4.0] - 2026-06-21
+
+### Added
+
+- `confluence` fenced code blocks are passed through to Confluence storage format verbatim — an escape hatch for macros with no Markdown equivalent (table of contents, status lozenges, Page Properties, …)
+- Obsidian-style image width syntax (`![alt|300](…)` and `![alt|300x200](…)`) and upload of local image files as page attachments
+
+### Changed
+
+- `commander` updated to v15
+
+### Fixed
+
+- Re-syncing a page no longer fails when an unchanged Mermaid diagram or local image is already attached — identical, content-hashed attachments are skipped instead of triggering a Confluence rollback error
+- Mermaid rendering polyfills a global `CSSStyleSheet`, fixing diagrams that depend on it
+
 ## [0.3.1] - 2026-04-28
 
 ### Added
diff --git a/package.json b/package.json
index 86a45bf..daecf8a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "markfluence",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "The best Markdown to Confluence converter. Modern, fast, correct.",
   "type": "module",
   "main": "dist/index.js",