diff --git a/changelog/upgrade-notes.md b/changelog/upgrade-notes.md
index 5aa85d168f..cf766cf7a1 100644
--- a/changelog/upgrade-notes.md
+++ b/changelog/upgrade-notes.md
@@ -179,7 +179,7 @@ var v3source = new ol.source.TileUTFGrid({
 
 #### Internet Explorer 9 support
 
-As of this release, OpenLayers requires a `classList` polyfill for IE 9 support. See http://cdn.polyfill.io/v2/docs/features#Element_prototype_classList.
+As of this release, OpenLayers requires a `classList` polyfill for IE 9 support. See https://cdn.polyfill.io/v2/docs/features#Element_prototype_classList.
 
 #### Immediate rendering API
 
@@ -228,7 +228,7 @@ The default cache size is `2048`.
 
 #### Internet Explorer 9 support
 
-As of this release, OpenLayers requires a `requestAnimationFrame`/`cancelAnimationFrame` polyfill for IE 9 support. See http://cdn.polyfill.io/v2/docs/features/#requestAnimationFrame.
+As of this release, OpenLayers requires a `requestAnimationFrame`/`cancelAnimationFrame` polyfill for IE 9 support. See https://cdn.polyfill.io/v2/docs/features/#requestAnimationFrame.
 
 #### Layer pre-/postcompose event changes
 
diff --git a/changelog/v3.14.0.md b/changelog/v3.14.0.md
index 0097dc92b9..24efc99c6e 100644
--- a/changelog/v3.14.0.md
+++ b/changelog/v3.14.0.md
@@ -17,7 +17,7 @@ The v3.14.0 release includes features and fixes from 93 pull requests since the
 
 #### Internet Explorer 9 support
 
-As of this release, OpenLayers requires a `requestAnimationFrame`/`cancelAnimationFrame` polyfill for IE 9 support. See http://cdn.polyfill.io/v2/docs/features/#requestAnimationFrame.
+As of this release, OpenLayers requires a `requestAnimationFrame`/`cancelAnimationFrame` polyfill for IE 9 support. See https://cdn.polyfill.io/v2/docs/features/#requestAnimationFrame.
 
 #### Layer pre-/postcompose event changes
 
diff --git a/changelog/v3.15.0.md b/changelog/v3.15.0.md
index e06539f1d3..5e5c161859 100644
--- a/changelog/v3.15.0.md
+++ b/changelog/v3.15.0.md
@@ -18,7 +18,7 @@ The v3.15.0 release includes features and fixes from 136 pull requests since the
 
 #### Internet Explorer 9 support
 
-As of this release, OpenLayers requires a `classList` polyfill for IE 9 support. See http://cdn.polyfill.io/v2/docs/features#Element_prototype_classList.
+As of this release, OpenLayers requires a `classList` polyfill for IE 9 support. See https://cdn.polyfill.io/v2/docs/features#Element_prototype_classList.
 
 #### Immediate rendering API
 
diff --git a/config/examples/example.html b/config/examples/example.html
index 2726943767..a744b63a36 100644
--- a/config/examples/example.html
+++ b/config/examples/example.html
@@ -74,7 +74,7 @@
     <title>{{ title }}</title>
     <link rel="stylesheet" href="http://openlayers.org/en/v{{ olVersion }}/css/ol.css" type="text/css">
     <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
-    <script src="http://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
+    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
     <script src="http://openlayers.org/en/v{{ olVersion }}/build/ol.js"></script>{{#if extraHead.remote}}
 {{ indent extraHead.remote spaces=4 }}{{/if}}{{#if css.source}}
     <style>
diff --git a/doc/quickstart.hbs b/doc/quickstart.hbs
index 0b6d81cd73..5c4eb6a16c 100644
--- a/doc/quickstart.hbs
+++ b/doc/quickstart.hbs
@@ -63,7 +63,7 @@ The first part is to include the JavaScript library. For the purpose of this tut
 **Optional:** If the application is intended to run on old platforms like Internet Explorer or Android 4.x, another script needs to be included before OpenLayers:
 
 ```xml
-  <script src="http://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList"></script>
+  <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList"></script>
 ```