diff --git a/client/src/components/UpgradeNotification/index.js b/client/src/components/UpgradeNotification/index.js
index b3d3ecf933..01913b2f26 100644
--- a/client/src/components/UpgradeNotification/index.js
+++ b/client/src/components/UpgradeNotification/index.js
@@ -17,7 +17,9 @@ const initUpgradeNotification = () => {
   const releasesUrl = 'https://releases.wagtail.org/latest.txt';
   const currentVersion = container.dataset.wagtailVersion;
 
-  fetch(releasesUrl).then(response => {
+  fetch(releasesUrl, {
+    referrerPolicy: 'strict-origin-when-cross-origin',
+  }).then(response => {
     if (response.status !== 200) {
       // eslint-disable-next-line no-console
       console.log(`Unexpected response from ${releasesUrl}. Status: ${response.status}`);