diff --git a/configs/testnet.json b/configs/testnet.json
index 3d76c22..cc830b8 100644
--- a/configs/testnet.json
+++ b/configs/testnet.json
@@ -61,10 +61,10 @@
     "show_apr_tooltip": false
   },
   "announcement_banner": {
-    "show_from": "",
-    "show_until": "",
-    "content": "",
-    "hideable": true,
+    "show_from": "2024-12-19T00:00+00:00",
+    "show_until": "2024-12-23T08:00+00:00",
+    "content": "Demex will be down for maintenance from 03:00 - 08:00 UTC, 23 Dec. We recommend closing any open orders during this time to minimize potential risks.",
+    "hideable": false,
     "show_only_on": []
   },
   "quick_select_deposit_options": [