diff --git a/_includes/header.html b/_includes/header.html
index d2f37e36e694..ca367f9d628e 100644
--- a/_includes/header.html
+++ b/_includes/header.html
@@ -15,7 +15,7 @@
           </div>
           {% endif %}
           <!-- Navbar Toggle -->
-          <button class="navbar-toggler collapsed ms-auto" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
+          <button class="navbar-toggler collapsed ms-auto" type="button" data-bs-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
             <span class="sr-only">Toggle navigation</span>
             <span class="icon-bar top-bar"></span>
             <span class="icon-bar middle-bar"></span>
@@ -56,7 +56,7 @@
               {%- if p.nav and p.autogen == nil -%}
               {%- if p.dropdown %}
               <li class="nav-item dropdown {% if page.title == p.title %}active{% endif %}">
-                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">{{ p.title }}
+                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">{{ p.title }}
                   {%- if page.title == p.title -%}
                   <span class="sr-only">(current)</span>
                   {%- endif -%}