diff --git a/app/Template/config/about.php b/app/Template/config/about.php
index 628fb0964..a12899454 100644
--- a/app/Template/config/about.php
+++ b/app/Template/config/about.php
@@ -5,11 +5,11 @@
     <ul>
         <li>
             <?= t('Official website:') ?>
-            <a href="https://kanboard.org/" target="_blank" rel="noreferer">https://kanboard.org/</a>
+            <a href="https://kanboard.org/" target="_blank" rel="noopener noreferrer">https://kanboard.org/</a>
         </li>
         <li>
             <?= t('Author:') ?>
-            <strong>Frédéric Guillot</strong> (<a href="https://github.com/kanboard/kanboard/graphs/contributors" target="_blank"><?= t('contributors') ?></a>)
+            <strong>Frédéric Guillot</strong> (<a href="https://github.com/kanboard/kanboard/graphs/contributors" target="_blank" rel="noopener noreferrer"><?= t('contributors') ?></a>)
         </li>
         <li>
             <?= t('License:') ?>
diff --git a/app/Template/plugin/directory.php b/app/Template/plugin/directory.php
index b2fffcb94..ab7df8078 100644
--- a/app/Template/plugin/directory.php
+++ b/app/Template/plugin/directory.php
@@ -15,7 +15,7 @@
     <table>
         <tr>
             <th colspan="3">
-                <a href="<?= $plugin['homepage'] ?>" target="_blank" rel="noreferrer"><?= $this->text->e($plugin['title']) ?></a>
+                <a href="<?= $plugin['homepage'] ?>" target="_blank" rel="noopener noreferrer"><?= $this->text->e($plugin['title']) ?></a>
             </th>
         </tr>
         <tr>
diff --git a/app/Template/plugin/show.php b/app/Template/plugin/show.php
index 266568ac0..90b62bd65 100644
--- a/app/Template/plugin/show.php
+++ b/app/Template/plugin/show.php
@@ -17,7 +17,7 @@
             <tr>
                 <td>
                     <?php if ($plugin->getPluginHomepage()): ?>
-                        <a href="<?= $plugin->getPluginHomepage() ?>" target="_blank" rel="noreferrer"><?= $this->text->e($plugin->getPluginName()) ?></a>
+                        <a href="<?= $plugin->getPluginHomepage() ?>" target="_blank" rel="noopener noreferrer"><?= $this->text->e($plugin->getPluginName()) ?></a>
                     <?php else: ?>
                         <?= $this->text->e($plugin->getPluginName()) ?>
                     <?php endif ?>
@@ -59,7 +59,7 @@
     <tr>
         <td>
             <?php if ($plugin->getPluginHomepage()): ?>
-                <a href="<?= $plugin->getPluginHomepage() ?>" target="_blank" rel="noreferrer"><?= $this->text->e($plugin->getPluginName()) ?></a>
+                <a href="<?= $plugin->getPluginHomepage() ?>" target="_blank" rel="noopener noreferrer"><?= $this->text->e($plugin->getPluginName()) ?></a>
             <?php else: ?>
                 <?= $this->text->e($plugin->getPluginName()) ?>
             <?php endif ?>