diff --git a/_layouts/default.html b/_layouts/default.html
index b4cc980..c937476 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -26,7 +26,7 @@
 
     <meta property="og:type" content="website" /> 
 
-    <script defer src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js" charset="utf-8"></script>
+    <script defer src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.21.0/moment.min.js" charset="utf-8"></script>
     <script defer src="/assets/js/office-hours.js" charset="utf-8"></script>
   </head>
   <body>
