diff --git a/_includes/head.html b/_includes/head.html
index e435d935..dcf2926f 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -4,7 +4,7 @@
 
 <link href="{% if site.atom_feed.path %}{{ site.atom_feed.path }}{% else %}{{ '/feed.xml' | relative_url }}{% endif %}" type="application/atom+xml" rel="alternate" title="{{ site.title }} Feed">
 
-<!-- http://t.co/dKP3o1e -->
+<!-- https://t.co/dKP3o1e -->
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
 <script>