diff --git a/normalize.html b/normalize.html
index d60f972..06c4bd7 100644
--- a/normalize.html
+++ b/normalize.html
@@ -248,12 +248,12 @@
             <header><h2>Images</h2></header>
             <div>
               <h3>No <code>&lt;figure&gt;</code> element</h3>
-              <p><img src="http://placekitten.com/480/480" alt="Image alt text"></p>
+              <p><img src="//placekitten.com/480/480" alt="Image alt text"></p>
               <h3>Wrapped in a <code>&lt;figure&gt;</code> element, no <code>&lt;figcaption&gt;</code></h3>
-              <figure><img src="http://placekitten.com/420/420" alt="Image alt text"></figure>
+              <figure><img src="//placekitten.com/420/420" alt="Image alt text"></figure>
               <h3>Wrapped in a <code>&lt;figure&gt;</code> element, with a <code>&lt;figcaption&gt;</code></h3>
               <figure>
-                <img src="http://placekitten.com/420/420" alt="Image alt text">
+                <img src="//placekitten.com/420/420" alt="Image alt text">
                 <figcaption>Here is a caption for this image.</figcaption>
               </figure>
             </div>
diff --git a/reset.html b/reset.html
index 19e4db1..81e585a 100644
--- a/reset.html
+++ b/reset.html
@@ -248,12 +248,12 @@
             <header><h2>Images</h2></header>
             <div>
               <h3>No <code>&lt;figure&gt;</code> element</h3>
-              <p><img src="http://placekitten.com/480/480" alt="Image alt text"></p>
+              <p><img src="//placekitten.com/480/480" alt="Image alt text"></p>
               <h3>Wrapped in a <code>&lt;figure&gt;</code> element, no <code>&lt;figcaption&gt;</code></h3>
-              <figure><img src="http://placekitten.com/420/420" alt="Image alt text"></figure>
+              <figure><img src="//placekitten.com/420/420" alt="Image alt text"></figure>
               <h3>Wrapped in a <code>&lt;figure&gt;</code> element, with a <code>&lt;figcaption&gt;</code></h3>
               <figure>
-                <img src="http://placekitten.com/420/420" alt="Image alt text">
+                <img src="//placekitten.com/420/420" alt="Image alt text">
                 <figcaption>Here is a caption for this image.</figcaption>
               </figure>
             </div>