diff --git a/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/solution.md b/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/solution.md
index 2862e600..4d175ca0 100644
--- a/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/solution.md
+++ b/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/solution.md
@@ -20,7 +20,7 @@ The fix is simple:
   }
 </script>
 
-<a href="http://w3.org" onclick="*!*return handler()*/!*">w3.org</a>
+<a href="https://w3.org" onclick="*!*return handler()*/!*">w3.org</a>
 ```
 
 Also we can use `event.preventDefault()`, like this:
@@ -35,5 +35,5 @@ Also we can use `event.preventDefault()`, like this:
 */!*
 </script>
 
-<a href="http://w3.org" onclick="*!*handler(event)*/!*">w3.org</a>
+<a href="https://w3.org" onclick="*!*handler(event)*/!*">w3.org</a>
 ```
diff --git a/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/task.md b/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/task.md
index 8fa4fb29..9a5bb98a 100644
--- a/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/task.md
+++ b/2-ui/2-events/04-default-browser-action/1-why-return-false-fails/task.md
@@ -14,7 +14,7 @@ Why in the code below `return false` doesn't work at all?
   }
 </script>
 
-<a href="http://w3.org" onclick="handler()">the browser will go to w3.org</a>
+<a href="https://w3.org" onclick="handler()">the browser will go to w3.org</a>
 ```
 
 The browser follows the URL on click, but we don't want it.
diff --git a/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/solution.view/index.html b/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/solution.view/index.html
index 90aecd9d..51ac0838 100644
--- a/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/solution.view/index.html
+++ b/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/solution.view/index.html
@@ -16,7 +16,7 @@
   <fieldset id="contents">
     <legend>#contents</legend>
     <p>
-      How about to read <a href="http://wikipedia.org">Wikipedia</a> or visit <a href="http://w3.org"><i>W3.org</i></a> and learn about modern standards?
+      How about to read <a href="https://wikipedia.org">Wikipedia</a> or visit <a href="https://w3.org"><i>W3.org</i></a> and learn about modern standards?
     </p>
   </fieldset>
 
diff --git a/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/source.view/index.html b/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/source.view/index.html
index b88834c9..f0c93439 100644
--- a/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/source.view/index.html
+++ b/2-ui/2-events/04-default-browser-action/2-catch-link-navigation/source.view/index.html
@@ -16,7 +16,7 @@
   <fieldset id="contents">
     <legend>#contents</legend>
     <p>
-      How about to read <a href="http://wikipedia.org">Wikipedia</a> or visit <a href="http://w3.org"><i>W3.org</i></a> and learn about modern standards?
+      How about to read <a href="https://wikipedia.org">Wikipedia</a> or visit <a href="https://w3.org"><i>W3.org</i></a> and learn about modern standards?
     </p>
   </fieldset>