diff --git a/public/index.html b/public/index.html
index f946192b..da07c2d3 100644
--- a/public/index.html
+++ b/public/index.html
@@ -23,8 +23,12 @@
   <link rel="stylesheet" href="style.css">
   <link rel="stylesheet" href="home.css">
   <link rel="stylesheet" href="live.css">
-  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css">
-  <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
+  <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css"
+    integrity="sha256-p4NxAoJBhIIN+hmNHrzRCf9tD/miZyoHS5obTRR9BMY="
+    crossorigin="anonymous">
+  <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"
+    integrity="sha256-20nQCchB9co0qIjJZRGuk2/Z9VM+kNiyxNV1lvTlZBo="
+    crossorigin="anonymous"></script>
   <script src="https://unpkg.com/leaflet.heat@0.2.0/dist/leaflet-heat.js"></script>
 </head>
 <body>
