diff --git a/src/theme/index.hbs b/src/theme/index.hbs
index 2bd43c96..410fdb60 100644
--- a/src/theme/index.hbs
+++ b/src/theme/index.hbs
@@ -10,12 +10,12 @@
         <base href="{{ path_to_root }}">
 
         <link rel="stylesheet" href="book.css">
-        <link href='http://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800' rel='stylesheet' type='text/css'>
+        <link href='https://fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800' rel='stylesheet' type='text/css'>
 
         <link rel="shortcut icon" href="{{ favicon }}">
 
         <!-- Font Awesome -->
-        <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
+        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css">
 
         <link rel="stylesheet" href="highlight.css">
         <link rel="stylesheet" href="tomorrow-night.css">
@@ -24,7 +24,7 @@
         <script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
 
         <!-- Fetch JQuery from CDN but have a local fallback -->
-        <script src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
+        <script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
         <script>
             if (typeof jQuery == 'undefined') {
                 document.write(unescape("%3Cscript src='jquery.js'%3E%3C/script%3E"));