diff --git a/_includes/head.html b/_includes/head.html
index d79bfbf0..dda47d7b 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -44,5 +44,5 @@
 
   <!-- CSS stylesheets -->
   <link href="/assets/css/style.css?v=7" rel="stylesheet">
-  <link id="dark-css" href="/assets/css/dark.css?v=3" rel="stylesheet" media="(prefers-color-scheme: dark)">
+  <link id="dark-css" href="/assets/css/dark.css?v=4" rel="stylesheet" media="(prefers-color-scheme: dark)">
 </head>