diff --git a/demo/_sections/interactive-content.rst b/demo/_sections/interactive-content.rst
index 8932f6a..3721503 100644
--- a/demo/_sections/interactive-content.rst
+++ b/demo/_sections/interactive-content.rst
@@ -108,11 +108,11 @@ Using ``container`` directive, you can work stack layouting.
 
       .. revealjs-fragments::
 
-         .. image:: https://placekitten.com/450/300
+         .. image:: https://picsum.photos/450/300
 
-         .. image:: https://placekitten.com/300/450
+         .. image:: https://picsum.photos/300/450
 
-         .. image:: https://placekitten.com/400/400
+         .. image:: https://picsum.photos/400/400
 
 .. revealjs-break::
 
@@ -122,8 +122,8 @@ Using ``container`` directive, you can work stack layouting.
 
    .. revealjs-fragments::
 
-      .. image:: https://placekitten.com/450/300
+      .. image:: https://picsum.photos/450/300
 
-      .. image:: https://placekitten.com/300/450
+      .. image:: https://picsum.photos/300/450
 
-      .. image:: https://placekitten.com/400/400
+      .. image:: https://picsum.photos/400/400
diff --git a/demo/index.rst b/demo/index.rst
index 73d5813..824033b 100644
--- a/demo/index.rst
+++ b/demo/index.rst
@@ -8,7 +8,7 @@ Introduction of sphinx-revealjs
 ===============================
 
 :Based version: 3.0.2
-:Demo updated: 2022-11-13
+:Demo updated: 2024-05-06 JST
 
 Overview
 ========