diff --git a/CHANGELOG.md b/CHANGELOG.md
index b963614..4710eeb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,19 @@
 
 All notable changes to this project will be documented in this file.
 
+## v1.0.0-beta4 - 2025-12-20
+
+- Teams Message Management
+  - Added UI (`frontend/teams-messages.html`) to load and review Teams channel messages with job details.
+  - Features: Auto-load via URL params, auto-select up to 50 messages, preview job card details, collapsible JSON.
+  - **Known Limitation**: Message deletion is not supported by Microsoft Teams Graph API for public channels (HTTP 405).
+    - This is a platform limitation, not an application error.
+    - Workaround 1: Delete messages directly from Teams client (right-click → Delete).
+    - Workaround 2: Use delegated user token with `ChatMessage.ReadWrite.All` permission (requires Azure AD configuration).
+  - Updated error handling to clearly explain Teams API limitations to users.
+- Ops
+  - Enhanced error logging in server delete endpoint to capture full error details and distinguish between API errors and Teams platform limitations.
+
 ## v1.0.0-beta3 - 2025-12-20
 
 - Teams Notifications