diff --git a/hugolib/embedded_shortcodes_test.go b/hugolib/embedded_shortcodes_test.go
index a6f38d8f7..b169cd74e 100644
--- a/hugolib/embedded_shortcodes_test.go
+++ b/hugolib/embedded_shortcodes_test.go
@@ -173,17 +173,17 @@ func TestShortcodeYoutube(t *testing.T) {
 	}{
 		{
 			`{{< youtube w7Ft2ymGmfc >}}`,
-			"(?s)\n<div style=\".*?\">.*?<iframe src=\"//www.youtube.com/embed/w7Ft2ymGmfc\" style=\".*?\" allowfullscreen title=\"YouTube Video\">.*?</iframe>.*?</div>\n",
+			"(?s)\n<div style=\".*?\">.*?<iframe src=\"https://www.youtube.com/embed/w7Ft2ymGmfc\" style=\".*?\" allowfullscreen title=\"YouTube Video\">.*?</iframe>.*?</div>\n",
 		},
 		// set class
 		{
 			`{{< youtube w7Ft2ymGmfc video>}}`,
-			"(?s)\n<div class=\"video\">.*?<iframe src=\"//www.youtube.com/embed/w7Ft2ymGmfc\" allowfullscreen title=\"YouTube Video\">.*?</iframe>.*?</div>\n",
+			"(?s)\n<div class=\"video\">.*?<iframe src=\"https://www.youtube.com/embed/w7Ft2ymGmfc\" allowfullscreen title=\"YouTube Video\">.*?</iframe>.*?</div>\n",
 		},
 		// set class and autoplay (using named params)
 		{
 			`{{< youtube id="w7Ft2ymGmfc" class="video" autoplay="true" >}}`,
-			"(?s)\n<div class=\"video\">.*?<iframe src=\"//www.youtube.com/embed/w7Ft2ymGmfc\\?autoplay=1\".*?allowfullscreen title=\"YouTube Video\">.*?</iframe>.*?</div>",
+			"(?s)\n<div class=\"video\">.*?<iframe src=\"https://www.youtube.com/embed/w7Ft2ymGmfc\\?autoplay=1\".*?allowfullscreen title=\"YouTube Video\">.*?</iframe>.*?</div>",
 		},
 	} {
 		var (
@@ -212,17 +212,17 @@ func TestShortcodeVimeo(t *testing.T) {
 	}{
 		{
 			`{{< vimeo 146022717 >}}`,
-			"(?s)\n<div style=\".*?\">.*?<iframe src=\"//player.vimeo.com/video/146022717\" style=\".*?\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>\n",
+			"(?s)\n<div style=\".*?\">.*?<iframe src=\"https://player.vimeo.com/video/146022717\" style=\".*?\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>\n",
 		},
 		// set class
 		{
 			`{{< vimeo 146022717 video >}}`,
-			"(?s)\n<div class=\"video\">.*?<iframe src=\"//player.vimeo.com/video/146022717\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>\n",
+			"(?s)\n<div class=\"video\">.*?<iframe src=\"https://player.vimeo.com/video/146022717\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>\n",
 		},
 		// set class (using named params)
 		{
 			`{{< vimeo id="146022717" class="video" >}}`,
-			"(?s)^<div class=\"video\">.*?<iframe src=\"//player.vimeo.com/video/146022717\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>",
+			"(?s)^<div class=\"video\">.*?<iframe src=\"https://player.vimeo.com/video/146022717\" webkitallowfullscreen mozallowfullscreen allowfullscreen>.*?</iframe>.*?</div>",
 		},
 	} {
 		var (
diff --git a/tpl/tplimpl/embedded/templates.autogen.go b/tpl/tplimpl/embedded/templates.autogen.go
index a386a05a5..5850d6874 100644
--- a/tpl/tplimpl/embedded/templates.autogen.go
+++ b/tpl/tplimpl/embedded/templates.autogen.go
@@ -466,10 +466,10 @@ if (!doNotTrack) {
 {{ template "_internal/shortcodes/vimeo_simple.html" . }}
 {{- else -}}
 {{ if .IsNamedParams }}<div {{ if .Get "class" }}class="{{ .Get "class" }}"{{ else }}style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"{{ end }}>
-  <iframe src="//player.vimeo.com/video/{{ .Get "id" }}" {{ if not (.Get "class") }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
+  <iframe src="https://player.vimeo.com/video/{{ .Get "id" }}" {{ if not (.Get "class") }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
  </div>{{ else }}
 <div {{ if len .Params | eq 2 }}class="{{ .Get 1 }}"{{ else }}style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"{{ end }}>
-  <iframe src="//player.vimeo.com/video/{{ .Get 0 }}" {{ if len .Params | eq 1 }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
+  <iframe src="https://player.vimeo.com/video/{{ .Get 0 }}" {{ if len .Params | eq 1 }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
  </div>
 {{ end }}
 {{- end -}}
@@ -499,7 +499,7 @@ if (!doNotTrack) {
 {{- $id := .Get "id" | default (.Get 0) -}}
 {{- $class := .Get "class" | default (.Get 1) }}
 <div {{ with $class }}class="{{ . }}"{{ else }}style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"{{ end }}>
-  <iframe src="//{{ $ytHost }}/embed/{{ $id }}{{ with .Get "autoplay" }}{{ if eq . "true" }}?autoplay=1{{ end }}{{ end }}" {{ if not $class }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}allowfullscreen title="YouTube Video"></iframe>
+  <iframe src="https://{{ $ytHost }}/embed/{{ $id }}{{ with .Get "autoplay" }}{{ if eq . "true" }}?autoplay=1{{ end }}{{ end }}" {{ if not $class }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}allowfullscreen title="YouTube Video"></iframe>
 </div>
 {{ end -}}
 `},
diff --git a/tpl/tplimpl/embedded/templates/shortcodes/vimeo.html b/tpl/tplimpl/embedded/templates/shortcodes/vimeo.html
index 2929aa4ab..94f03470e 100644
--- a/tpl/tplimpl/embedded/templates/shortcodes/vimeo.html
+++ b/tpl/tplimpl/embedded/templates/shortcodes/vimeo.html
@@ -4,10 +4,10 @@
 {{ template "_internal/shortcodes/vimeo_simple.html" . }}
 {{- else -}}
 {{ if .IsNamedParams }}<div {{ if .Get "class" }}class="{{ .Get "class" }}"{{ else }}style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"{{ end }}>
-  <iframe src="//player.vimeo.com/video/{{ .Get "id" }}" {{ if not (.Get "class") }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
+  <iframe src="https://player.vimeo.com/video/{{ .Get "id" }}" {{ if not (.Get "class") }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
  </div>{{ else }}
 <div {{ if len .Params | eq 2 }}class="{{ .Get 1 }}"{{ else }}style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"{{ end }}>
-  <iframe src="//player.vimeo.com/video/{{ .Get 0 }}" {{ if len .Params | eq 1 }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
+  <iframe src="https://player.vimeo.com/video/{{ .Get 0 }}" {{ if len .Params | eq 1 }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>
  </div>
 {{ end }}
 {{- end -}}
diff --git a/tpl/tplimpl/embedded/templates/shortcodes/youtube.html b/tpl/tplimpl/embedded/templates/shortcodes/youtube.html
index ff268c511..9e8477659 100644
--- a/tpl/tplimpl/embedded/templates/shortcodes/youtube.html
+++ b/tpl/tplimpl/embedded/templates/shortcodes/youtube.html
@@ -4,6 +4,6 @@
 {{- $id := .Get "id" | default (.Get 0) -}}
 {{- $class := .Get "class" | default (.Get 1) }}
 <div {{ with $class }}class="{{ . }}"{{ else }}style="position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;"{{ end }}>
-  <iframe src="//{{ $ytHost }}/embed/{{ $id }}{{ with .Get "autoplay" }}{{ if eq . "true" }}?autoplay=1{{ end }}{{ end }}" {{ if not $class }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}allowfullscreen title="YouTube Video"></iframe>
+  <iframe src="https://{{ $ytHost }}/embed/{{ $id }}{{ with .Get "autoplay" }}{{ if eq . "true" }}?autoplay=1{{ end }}{{ end }}" {{ if not $class }}style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; border:0;" {{ end }}allowfullscreen title="YouTube Video"></iframe>
 </div>
 {{ end -}}