diff --git a/_layouts/default.html b/_layouts/default.html
index 0dcb81a..91e2732 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -11,8 +11,9 @@
 	<div class="container-fluid primary-container">
 	  <nav class="navbar navbar-expand-lg navbar-dark bg-dark site-header">
 		<a class="navbar-brand" href="{{ site.baseurl }}/">{{ site.name }}</a>
-		<button class="navbar-toggler" type="button" data-toggle="collapse"
-				data-target="#nav-links" aria-label="Toggle navigation"
+
+		<button class="navbar-toggler" type="button" data-bs-toggle="collapse"
+				data-bs-target="#nav-links" aria-label="Toggle navigation"
 				aria-controls="nav-links" aria-expanded="false">
 		  <span class="navbar-toggler-icon"></span>
 		</button>