diff --git a/index.html b/index.html
index 46d724f..6eca661 100644
--- a/index.html
+++ b/index.html
@@ -102,8 +102,8 @@ $ http ifconfig.co/port/8080
       <div class="pure-u-1-1 footer">
         <p class="footer">
           To force IPv4 lookup you can use
-          the <a href="http://v4.ifconfig.co">v4 subdomain</a>
-          (<a href="http://v6.ifconfig.co">or v6 for IPv6</a>).
+          the <a href="https://v4.ifconfig.co">v4 subdomain</a>
+          (<a href="https://v6.ifconfig.co">or v6 for IPv6</a>).
         </p>
       </div>
     </div>