diff --git a/src/ZenSidebarManager.mjs b/src/ZenSidebarManager.mjs
index c0e5dd7..abde7e1 100644
--- a/src/ZenSidebarManager.mjs
+++ b/src/ZenSidebarManager.mjs
@@ -13,7 +13,7 @@ var gZenBrowserManagerSidebar = {
   backButton: null,
   progressListener: null,
 
-  DEFAULT_MOBILE_USER_AGENT: 'Mozilla/5.0 (Android 12; Mobile; rv:129.0) Gecko/20100101 Firefox/130.0',
+  DEFAULT_MOBILE_USER_AGENT: 'Mozilla/5.0 (Android 12; Mobile; rv:129.0) Gecko/20100101 Firefox/131.0',
   MAX_SIDEBAR_PANELS: 9, // +1 for the add panel button
   MAX_RUNS: 3,