diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a2b6e1..b416a82 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Hermes Web UI -- Changelog
 
+## [v0.50.61] — 2026-04-16
+
+### Added
+- **Office file attachments** — `.xls`, `.xlsx`, `.doc`, and `.docx` files can now be selected via the attach button. The file picker's `accept` attribute is extended to include Office MIME types, and the backend MIME map is updated so these files are served with correct content-type headers when accessed through the workspace file browser. Files are saved as binary to the workspace; the AI can reference them by name the same way it does PDFs. (PR #566 by @renheqiang)
+
 ## [v0.50.60] — 2026-04-16
 
 ### Changed
diff --git a/api/config.py b/api/config.py
index 520dffc..f5567a2 100644
--- a/api/config.py
+++ b/api/config.py
@@ -342,6 +342,7 @@ MAX_UPLOAD_BYTES = 20 * 1024 * 1024
 # ── File type maps ───────────────────────────────────────────────────────────
 IMAGE_EXTS = {".png", ".jpg", ".jpeg", ".gif", ".svg", ".webp", ".ico", ".bmp"}
 MD_EXTS = {".md", ".markdown", ".mdown"}
+OFFICE_EXTS = {".xls", ".xlsx", ".doc", ".docx"}
 CODE_EXTS = {
     ".py",
     ".js",
@@ -380,6 +381,10 @@ MIME_MAP = {
     ".bmp": "image/bmp",
     ".pdf": "application/pdf",
     ".json": "application/json",
+    ".xls": "application/vnd.ms-excel",
+    ".xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+    ".doc": "application/msword",
+    ".docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
 }
 
 # ── Toolsets (from config.yaml or hardcoded default) ─────────────────────────
diff --git a/static/index.html b/static/index.html
index 6d02137..95454db 100644
--- a/static/index.html
+++ b/static/index.html
@@ -274,7 +274,7 @@
         <textarea id="msg" rows="1" placeholder="Message Hermes…"></textarea>
         <div class="composer-footer">
           <div class="composer-left">
-            <input type="file" id="fileInput" multiple accept="image/*,text/*,application/pdf,application/json,.md,.py,.js,.ts,.yaml,.yml,.toml,.csv,.sh,.txt,.log,.env" style="display:none">
+            <input type="file" id="fileInput" multiple accept="image/*,text/*,application/pdf,application/json,application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,.md,.py,.js,.ts,.yaml,.yml,.toml,.csv,.sh,.txt,.log,.env,.xls,.xlsx,.doc,.docx" style="display:none">
             <button class="icon-btn" id="btnAttach" title="Attach files">
               <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"/></svg>
             </button>
@@ -553,7 +553,7 @@
                 <div class="settings-section-title">System</div>
                 <div class="settings-section-meta">Instance version and access controls.</div>
               </div>
-              <span class="settings-version-badge">v0.50.60</span>
+              <span class="settings-version-badge">v0.50.61</span>
             </div>
             <div class="settings-field" style="border-top:1px solid var(--border);padding-top:12px;margin-top:8px">
               <label for="settingsPassword" data-i18n="settings_label_password">Access Password</label>