diff --git a/main.js b/main.js
index 8720e82..37fe88c 100644
--- a/main.js
+++ b/main.js
@@ -245,6 +245,11 @@ async function main() {
     map.addOverlay(overlayElement);
   }
 
+  function isRecentTimestamp (tst) {
+    // newer than 2 hours ago?
+    return (tst * 1000) > (Date.now() - 2*60*60*1000);
+  }
+
   function updateData(startInterval=false) {
     fetch('https://r2b22.kip.pe/last.json')
       .then(response => response.json())
@@ -255,6 +260,7 @@ async function main() {
 
         for (const item of data) {
           if (!tourStatus.participants.includes(item.name)) continue;
+          if (!isRecentTimestamp(item.tst)) continue;
           createParticipantHTML(item.name);
           createParticipantOverlay(item.name);
           const overlay = peopleOverlays[item.name];