diff --git a/services/backend/thiamsu/templates/thiamsu/base.html b/services/backend/thiamsu/templates/thiamsu/base.html
index 73cd978..d84fa60 100644
--- a/services/backend/thiamsu/templates/thiamsu/base.html
+++ b/services/backend/thiamsu/templates/thiamsu/base.html
@@ -124,6 +124,7 @@ <h5>會員註冊或登入</h5>
                         <div class="embed-responsive embed-responsive-16by9">
                             <iframe class="embed-responsive-item"
                                     src="https://www.youtube.com/embed/{{ headline.youtube_id }}"
+                                    referrerpolicy="no-referrer-when-downgrade"
                                     frameborder="0" allowfullscreen></iframe>
                         </div>
                     </div>