diff --git a/docs/index.html b/docs/index.html
index 9f1f106..861d5ca 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -608,7 +608,7 @@ <h3 id="subsection-image">Image</h3>
   <!-- Start of #subsection-broken-image -->
   <h3 id="subsection-lazy-loaded-image">Lazy-loaded Image</h3>
   <img
-    src="http://dummyimage.com/500x500?text=Lazy-Loaded+Image+Example"
+    src="https://dummyimage.com/500x500?text=Lazy-Loaded+Image+Example"
     loading="lazy"
     decoding="async"
     width="500"
@@ -627,7 +627,7 @@ <h3 id="subsection-broken-image">Broken Image</h3>
   <h3 id="subsection-figure-with-caption">Figure with Caption</h3>
   <figure>
     <img
-      src="http://dummyimage.com/400x250?text=Figure+Example"
+      src="https://dummyimage.com/400x250?text=Figure+Example"
       alt="Figure Example" />
     <figcaption>
       An example figure caption.
@@ -677,11 +677,11 @@ <h3 id="subsection-picture">Picture</h3>
   <picture>
     <source
       media="(min-width: 40em)"
-      srcset="http://dummyimage.com/800x450/7ED321/ffffff/?text=1x+Source+w/Breakpoint+Example 1x,
-              http://dummyimage.com/800x600/7ED321/ffffff/?text=2x+Source+w/Breakpoint+Example 2x" />
+      srcset="https://dummyimage.com/800x450/7ED321/ffffff/?text=1x+Source+w/Breakpoint+Example 1x,
+              https://dummyimage.com/800x600/7ED321/ffffff/?text=2x+Source+w/Breakpoint+Example 2x" />
     <source
-      srcset="http://dummyimage.com/500x250/F5A623/ffffff/?text=1x+Source+Example 1x,
-              http://dummyimage.com/500x250/F5A623/ffffff/?text=2x+Source+Example 2x" />
+      srcset="https://dummyimage.com/500x250/F5A623/ffffff/?text=1x+Source+Example 1x,
+              https://dummyimage.com/500x250/F5A623/ffffff/?text=2x+Source+Example 2x" />
     <img
       src="https://dummyimage.com/600x400?text==Img+Fallback"
       alt="Picture Element" />
@@ -691,9 +691,9 @@ <h3 id="subsection-picture">Picture</h3>
   <!-- Start of #subsection-image-with-srcset-and-sizes -->
   <h3 id="subsection-image-with-srcset-and-sizes">Image with Srcset and Sizes</h3>
   <img
-    srcset="http://dummyimage.com/1024x768/7ED321/ffffff/?text=Large 1024w,
-            http://dummyimage.com/1024x768/F5A623/ffffff/?text=Medium 640w,
-            http://dummyimage.com/320x240/50E3C2/ffffff/?text=Small 320w"
+    srcset="https://dummyimage.com/1024x768/7ED321/ffffff/?text=Large 1024w,
+            https://dummyimage.com/1024x768/F5A623/ffffff/?text=Medium 640w,
+            https://dummyimage.com/320x240/50E3C2/ffffff/?text=Small 320w"
     sizes="(min-width: 36em) 50vw, 100vw"
     src="https://dummyimage.com/600x400?text==Img+Fallback"
     alt="Image with Srcset and Sizes Example" />
@@ -738,7 +738,7 @@ <h3 id="subsection-audio">Audio</h3>
   <h3 id="subsection-video">Video</h3>
   <video
     controls
-    poster="http://dummyimage.com/854x480?text=Video+Poster">
+    poster="https://dummyimage.com/854x480?text=Video+Poster">
     <source
       src="http://clips.vorwaerts-gmbh.de/VfE_html5.mp4"
       type="video/mp4" />
diff --git a/partials/section.embedded.hbs b/partials/section.embedded.hbs
index d2be6d8..9338a83 100644
--- a/partials/section.embedded.hbs
+++ b/partials/section.embedded.hbs
@@ -12,7 +12,7 @@
   <!-- Start of #subsection-broken-image -->
   <h3 id="subsection-lazy-loaded-image">Lazy-loaded Image</h3>
   <img
-    src="http://dummyimage.com/500x500?text=Lazy-Loaded+Image+Example"
+    src="https://dummyimage.com/500x500?text=Lazy-Loaded+Image+Example"
     loading="lazy"
     decoding="async"
     width="500"
@@ -31,7 +31,7 @@
   <h3 id="subsection-figure-with-caption">Figure with Caption</h3>
   <figure>
     <img
-      src="http://dummyimage.com/400x250?text=Figure+Example"
+      src="https://dummyimage.com/400x250?text=Figure+Example"
       alt="Figure Example" />
     <figcaption>
       An example figure caption.
@@ -81,11 +81,11 @@
   <picture>
     <source
       media="(min-width: 40em)"
-      srcset="http://dummyimage.com/800x450/7ED321/ffffff/?text=1x+Source+w/Breakpoint+Example 1x,
-              http://dummyimage.com/800x600/7ED321/ffffff/?text=2x+Source+w/Breakpoint+Example 2x" />
+      srcset="https://dummyimage.com/800x450/7ED321/ffffff/?text=1x+Source+w/Breakpoint+Example 1x,
+              https://dummyimage.com/800x600/7ED321/ffffff/?text=2x+Source+w/Breakpoint+Example 2x" />
     <source
-      srcset="http://dummyimage.com/500x250/F5A623/ffffff/?text=1x+Source+Example 1x,
-              http://dummyimage.com/500x250/F5A623/ffffff/?text=2x+Source+Example 2x" />
+      srcset="https://dummyimage.com/500x250/F5A623/ffffff/?text=1x+Source+Example 1x,
+              https://dummyimage.com/500x250/F5A623/ffffff/?text=2x+Source+Example 2x" />
     <img
       src="https://dummyimage.com/600x400?text==Img+Fallback"
       alt="Picture Element" />
@@ -95,9 +95,9 @@
   <!-- Start of #subsection-image-with-srcset-and-sizes -->
   <h3 id="subsection-image-with-srcset-and-sizes">Image with Srcset and Sizes</h3>
   <img
-    srcset="http://dummyimage.com/1024x768/7ED321/ffffff/?text=Large 1024w,
-            http://dummyimage.com/1024x768/F5A623/ffffff/?text=Medium 640w,
-            http://dummyimage.com/320x240/50E3C2/ffffff/?text=Small 320w"
+    srcset="https://dummyimage.com/1024x768/7ED321/ffffff/?text=Large 1024w,
+            https://dummyimage.com/1024x768/F5A623/ffffff/?text=Medium 640w,
+            https://dummyimage.com/320x240/50E3C2/ffffff/?text=Small 320w"
     sizes="(min-width: 36em) 50vw, 100vw"
     src="https://dummyimage.com/600x400?text==Img+Fallback"
     alt="Image with Srcset and Sizes Example" />
@@ -142,7 +142,7 @@
   <h3 id="subsection-video">Video</h3>
   <video
     controls
-    poster="http://dummyimage.com/854x480?text=Video+Poster">
+    poster="https://dummyimage.com/854x480?text=Video+Poster">
     <source
       src="http://clips.vorwaerts-gmbh.de/VfE_html5.mp4"
       type="video/mp4" />