diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f5c59b..9115f61 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,15 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ---
 
+## [1.5.0] - 2026-05-19
+
+### Changed
+
+- **`ARCHITECTURE.md`** — consolidated the two existing architecture documents (root concise reference and `docs/ARCHITECTURE.md` deep-dive) into a single comprehensive reference at the project root. The merged document covers all 11 sections: Introduction, High-Level Architecture, Pluggable Architecture Layers (PDCA + PALDRA), Webhook System, Data Flow and Real-time Updates, Caching and Smart Polling, Key Subsystems, Directory Structure, Configuration and Environment Variables, Security Model, and Technology Stack. Includes full Mermaid diagrams for system overview, polling cycle, webhook path, UI state machine, and download matching pipeline.
+- **`docs/ARCHITECTURE.md`** — removed; content fully merged into root `ARCHITECTURE.md`.
+
+---
+
 ## [1.4.0] - 2026-05-19
 
 ### Added
diff --git a/package.json b/package.json
index ff12476..4d3c60f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sofarr",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "A personal media download dashboard that shows your downloads 'so far' while you relax on the sofa waiting for your *arr services to finish",
   "main": "server/index.js",
   "scripts": {