diff --git a/index.html b/index.html
index fcc98e6..f0e2505 100644
--- a/index.html
+++ b/index.html
@@ -16,7 +16,8 @@
 		<script src="https://cdnjs.cloudflare.com/ajax/libs/showdown/2.1.0/showdown.min.js" integrity="sha512-LhccdVNGe2QMEfI3x4DVV3ckMRe36TfydKss6mJpdHjNFiV07dFpS2xzeZedptKZrwxfICJpez09iNioiSZ3hA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
 		<script src="main.js"></script>
 
-		<script type="text/javascript" src="https://unpkg.com/vis-network/standalone/umd/vis-network.min.js"></script>
+		<script src="https://cdnjs.cloudflare.com/ajax/libs/vis/4.21.0/vis-network.min.js" integrity="sha512-GE9mKnPrTn2DY5AZuIC9yE6K4FF8T+9lsO7jwHn+RW9rEjnHzF/in0oGwlPzRwjhQ+oJiawmtfvleX+l6h5/cA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+
 		<div id="networkpage" hidden>
 			<div id="network"></div>
 		</div>