diff --git a/templates/element/action-groups.php b/templates/element/action-groups.php
index 6ac8175..443208a 100644
--- a/templates/element/action-groups.php
+++ b/templates/element/action-groups.php
@@ -16,7 +16,7 @@
 
 <?php foreach ($groups as $key => $group) : ?>
     <div class='btn-group' role="group">
-        <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
+        <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
             <?= $key ?>
         </button>
         <div class="dropdown-menu dropdown-menu-right">
diff --git a/templates/element/form/tabs.php b/templates/element/form/tabs.php
index b22706b..649fa48 100644
--- a/templates/element/form/tabs.php
+++ b/templates/element/form/tabs.php
@@ -6,7 +6,7 @@
         <?php $firstTab = key($formTabGroups) ?>
         <?php foreach ($formTabGroups as $group => $groupFields) : ?>
             <li role="presentation" <?= $group === $firstTab ? 'class="active"' : '' ?>>
-                <a href="#tab-<?= mb_strtolower(Text::slug($group)) ?>" role="tab" data-toggle="tab"><?= $group ?></a>
+                <a href="#tab-<?= mb_strtolower(Text::slug($group)) ?>" role="tab" data-bs-toggle="tab"><?= $group ?></a>
             </li>
         <?php endforeach ?>
     </ul>
diff --git a/templates/element/menu/dropdown.php b/templates/element/menu/dropdown.php
index b406a1d..1458ab0 100644
--- a/templates/element/menu/dropdown.php
+++ b/templates/element/menu/dropdown.php
@@ -1,5 +1,5 @@
 <li class="dropdown alerts-dropdown">
-    <a href="#" class="dropdown-toggle" data-toggle="dropdown"><?= $dropdown->getTitle() ?></a>
+    <a href="#" class="dropdown-toggle" data-bs-toggle="dropdown"><?= $dropdown->getTitle() ?></a>
     <ul class="dropdown-menu">
         <?php
         foreach ($dropdown->getEntries() as $entry) {
diff --git a/templates/layout/default.php b/templates/layout/default.php
index b6c7469..40ef986 100644
--- a/templates/layout/default.php
+++ b/templates/layout/default.php
@@ -12,30 +12,30 @@
 </head>
 <body>
     <nav class="navbar navbar-light bg-light" role="navigation">
-            <button type="button" class="navbar-toggler mr-2" data-toggle="collapse" data-target=".navbar-ex1-collapse">
-                <span class="navbar-toggler-icon"></span>
-            </button>
-            <?php
-            $siteTitleContent = $siteTitle;
-            if (!empty($siteTitleImage)) {
-                $siteTitleContent = $this->Html->image($siteTitleImage, ['class' => 'navbar-brand mr-auto']);
-            }
-            if (empty($siteTitleLink)) {
-                echo $this->Html->tag(
-                    'span',
-                    $siteTitleContent,
-                    ['class' => 'navbar-brand mr-auto', 'escape' => false]
-                );
-            } else {
-                echo $this->Html->link(
-                    $siteTitleContent,
-                    $siteTitleLink,
-                    ['class' => 'navbar-brand mr-auto', 'escape' => false]
-                );
-            }
-            ?>
+        <button type="button" class="navbar-toggler mr-2" data-bs-toggle="collapse" data-bs-target=".navbar-ex1-collapse">
+            <span class="navbar-toggler-icon"></span>
+        </button>
+        <?php
+        $siteTitleContent = $siteTitle;
+        if (!empty($siteTitleImage)) {
+            $siteTitleContent = $this->Html->image($siteTitleImage, ['class' => 'navbar-brand mr-auto']);
+        }
+        if (empty($siteTitleLink)) {
+            echo $this->Html->tag(
+                'span',
+                $siteTitleContent,
+                ['class' => 'navbar-brand mr-auto', 'escape' => false]
+            );
+        } else {
+            echo $this->Html->link(
+                $siteTitleContent,
+                $siteTitleLink,
+                ['class' => 'navbar-brand mr-auto', 'escape' => false]
+            );
+        }
+        ?>
 
-            <?= $this->element('topbar'); ?>
+        <?= $this->element('topbar'); ?>
     </nav>
 
     <div class="container-fluid">
