diff --git a/templates/header.html b/templates/header.html
index 6eb6063..0334a39 100644
--- a/templates/header.html
+++ b/templates/header.html
@@ -57,13 +57,13 @@
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   <script src="https://cdnjs.cloudflare.com/ajax/libs/tempusdominus-bootstrap-4/5.39.0/js/tempusdominus-bootstrap-4.min.js" integrity="sha512-k6/Bkb8Fxf/c1Tkyl39yJwcOZ1P4cRrJu77p83zJjN2Z55prbFHxPs9vN7q3l3+tSMGPDdoH51AEU8Vgo1cgAA==" crossorigin="anonymous"></script>
-  <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.8.0/highlight.min.js" integrity="sha512-rdhY3cbXURo13l/WU9VlaRyaIYeJ/KBakckXIvJNAQde8DgpOmE+eZf7ha4vdqVjTtwQt69bD2wH2LXob/LB7Q==" crossorigin="anonymous"></script>
+  <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/highlight.min.js" integrity="sha512-D9gUyxqja7hBtkWpPWGt9wfbfaMGVt9gnyCvYa+jojwwPHLCzUm5i8rpk7vD7wNee9bA35eYIjobYPaQuKS1MQ==" crossorigin="anonymous"></script>
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   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/5.3.2/css/bootstrap.min.css" integrity="sha512-b2QcS5SsA8tZodcDtGRELiGv5SaKSk1vDHDaQRda0htPYWZ6046lr3kJ5bAAQdpV2mmA/4v0wQF9MyU6/pDIAg==" crossorigin="anonymous" />
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-social/5.1.1/bootstrap-social.min.css" integrity="sha512-f8mUMCRNrJxPBDzPJx3n+Y5TC5xp6SmStstEfgsDXZJTcxBakoB5hvPLhAfJKa9rCvH+n3xpJ2vQByxLk4WP2g==" crossorigin="anonymous" />
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tempusdominus-bootstrap-4/5.39.0/css/tempusdominus-bootstrap-4.min.css" integrity="sha512-3JRrEUwaCkFUBLK1N8HehwQgu8e23jTH4np5NHOmQOobuC4ROQxFwFgBLTnhcnQRMs84muMh0PnnwXlPq5MGjg==" crossorigin="anonymous" />
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css" integrity="sha512-z3gLpd7yknf1YoNbCzqRKc4qyor8gaKU1qmn+CShxbuBusANI9QpRohGBreCFkKxLhei6S9CQXFEbbKuqLg0DA==" crossorigin="anonymous" />
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+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.9.0/styles/default.min.css" integrity="sha512-hasIneQUHlh06VNBe7f6ZcHmeRTLIaQWFd43YriJ0UND19bvYRauxthDg8E4eVNPm9bRUhr5JGeqH7FRFXQu5g==" crossorigin="anonymous" />
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   <script src="/js/inline-attachment.js"></script>