diff --git a/app/templates/base.html b/app/templates/base.html
index ec5e5283..1717d553 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -15,7 +15,7 @@
 	<meta name="og:description" content="{{ self.description() | normalize_whitespace }}">
 	{%- endif %}
 
-	<link rel="stylesheet" type="text/css" href="/static/libs/bootstrap.min.css?v=3">
+	<link rel="stylesheet" type="text/css" href="/static/libs/bootstrap.min.css?v=4">
 	<link rel="stylesheet" type="text/css" href="/static/custom.css?v=49">
 	<link rel="search" type="application/opensearchdescription+xml" href="/static/opensearch.xml" title="ContentDB" />