diff --git a/stt/client/stt/ui/app.py b/stt/client/stt/ui/app.py
index c0eda31..6092604 100644
--- a/stt/client/stt/ui/app.py
+++ b/stt/client/stt/ui/app.py
@@ -18,8 +18,24 @@ from typing import Any
 HUD_DIR = Path(__file__).resolve().parent.parent / "hud"
 
 
+class _HudHandler(SimpleHTTPRequestHandler):
+    """Sert le HUD en interdisant le cache navigateur.
+
+    Sans ça, le navigateur garde l'ancien index.html après une mise à jour
+    (symptôme classique : « je vois encore l'ancienne version »).
+    """
+
+    def end_headers(self):
+        self.send_header("Cache-Control", "no-store, max-age=0")
+        self.send_header("Pragma", "no-cache")
+        super().end_headers()
+
+    def log_message(self, *args):  # silence le log HTTP par requête
+        pass
+
+
 def _start_http(host: str, port: int) -> ThreadingHTTPServer:
-    handler = partial(SimpleHTTPRequestHandler, directory=str(HUD_DIR))
+    handler = partial(_HudHandler, directory=str(HUD_DIR))
     httpd = ThreadingHTTPServer((host, port), handler)
     threading.Thread(target=httpd.serve_forever, daemon=True).start()
     return httpd