diff --git a/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php b/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php
index 2579dcbf9e05e9d64ca7c5c1f59e79c96003d460..b77acedf7ff27a3a7fc0b658d5621a63afa4a2dc 100644
--- a/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php
+++ b/core/modules/link/src/Plugin/Field/FieldType/LinkItem.php
@@ -138,7 +138,7 @@ public static function generateSampleValue(FieldDefinitionInterface $field_defin
           $values['title'] = mt_rand(0, 1) ? $random->sentences(4) : '';
           break;
       }
-      $values['uri'] = 'http://www.' . $random->word($domain_length) . '.' . $tlds[mt_rand(0, (count($tlds) - 1))];
+      $values['uri'] = 'https://www.' . $random->word($domain_length) . '.' . $tlds[mt_rand(0, (count($tlds) - 1))];
     }
     else {
       $values['uri'] = 'base:' . $random->name(mt_rand(1, 64));
diff --git a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
index 80c5704f343b02682d3a46ab272643d4979f73ce..b596be82f73c7c889693876bc13edf7057fc4de7 100644
--- a/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
+++ b/core/modules/link/src/Plugin/Field/FieldWidget/LinkWidget.php
@@ -234,12 +234,12 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     // If the field is configured to allow both internal and external links,
     // show a useful description.
     elseif ($this->supportsExternalLinks() && $this->supportsInternalLinks()) {
-      $element['uri']['#description'] = $this->t('Start typing the title of a piece of content to select it. You can also enter an internal path such as %add-node or an external URL such as %url. Enter %front to link to the front page. Enter %nolink to display link text only. Enter %button to display keyboard-accessible link text only.', ['%front' => '<front>', '%add-node' => '/node/add', '%url' => 'http://example.com', '%nolink' => '<nolink>', '%button' => '<button>']);
+      $element['uri']['#description'] = $this->t('Start typing the title of a piece of content to select it. You can also enter an internal path such as %add-node or an external URL such as %url. Enter %front to link to the front page. Enter %nolink to display link text only. Enter %button to display keyboard-accessible link text only.', ['%front' => '<front>', '%add-node' => '/node/add', '%url' => 'https://example.com', '%nolink' => '<nolink>', '%button' => '<button>']);
     }
     // If the field is configured to allow only external links, show a useful
     // description.
     elseif ($this->supportsExternalLinks() && !$this->supportsInternalLinks()) {
-      $element['uri']['#description'] = $this->t('This must be an external URL such as %url.', ['%url' => 'http://example.com']);
+      $element['uri']['#description'] = $this->t('This must be an external URL such as %url.', ['%url' => 'https://example.com']);
     }
 
     // Make uri required on the front-end when title filled-in.
diff --git a/core/modules/link/tests/src/Functional/LinkFieldUITest.php b/core/modules/link/tests/src/Functional/LinkFieldUITest.php
index dd4fe7370a0bbf53c5bd7688e87c4736d5e43b84..ac8d37f5b2fe8c1e6732157fc4e0c363d82e0968 100644
--- a/core/modules/link/tests/src/Functional/LinkFieldUITest.php
+++ b/core/modules/link/tests/src/Functional/LinkFieldUITest.php
@@ -96,7 +96,7 @@ protected function providerTestFieldUI() {
       DRUPAL_OPTIONAL,
     ];
     $link_types = [
-      LinkItemInterface::LINK_EXTERNAL => 'http://example.com',
+      LinkItemInterface::LINK_EXTERNAL => 'https://example.com',
       LinkItemInterface::LINK_GENERIC => '',
       LinkItemInterface::LINK_INTERNAL => '<front>',
     ];
@@ -119,7 +119,7 @@ protected function providerTestFieldUI() {
             ]);
 
             // Use a unique label that contains some HTML.
-            $label = '<img src="http://example.com">' . $id;
+            $label = '<img src="https://example.com">' . $id;
 
             yield [
               $cardinality,
@@ -191,8 +191,8 @@ public function runFieldUIItem($cardinality, $link_type, $title, $label, $field_
     $this->drupalGet($add_path);
 
     $expected_help_texts = [
-      LinkItemInterface::LINK_EXTERNAL => 'This must be an external URL such as <em class="placeholder">http://example.com</em>.',
-      LinkItemInterface::LINK_GENERIC => 'You can also enter an internal path such as <em class="placeholder">/node/add</em> or an external URL such as <em class="placeholder">http://example.com</em>. Enter <em class="placeholder">&lt;front&gt;</em> to link to the front page. Enter <em class="placeholder">&lt;nolink&gt;</em> to display link text only',
+      LinkItemInterface::LINK_EXTERNAL => 'This must be an external URL such as <em class="placeholder">https://example.com</em>.',
+      LinkItemInterface::LINK_GENERIC => 'You can also enter an internal path such as <em class="placeholder">/node/add</em> or an external URL such as <em class="placeholder">https://example.com</em>. Enter <em class="placeholder">&lt;front&gt;</em> to link to the front page. Enter <em class="placeholder">&lt;nolink&gt;</em> to display link text only',
       LinkItemInterface::LINK_INTERNAL => rtrim(Url::fromRoute('<front>', [], ['absolute' => TRUE])->toString(), '/'),
     ];