diff --git a/topology/University of Oklahoma/OU ATLAS/OU_OSCER_ATLAS_downtime.yaml b/topology/University of Oklahoma/OU ATLAS/OU_OSCER_ATLAS_downtime.yaml
index 642f597f0..9fcb8105b 100644
--- a/topology/University of Oklahoma/OU ATLAS/OU_OSCER_ATLAS_downtime.yaml	
+++ b/topology/University of Oklahoma/OU ATLAS/OU_OSCER_ATLAS_downtime.yaml	
@@ -481,3 +481,15 @@
   - GridFtp
   - XRootD component
 # ---------------------------------------------------------
+- Class: SCHEDULED
+  ID: 984612649
+  Description: OSCER DNS upgrade
+  Severity: Outage
+  StartTime: Oct 04, 2021 16:00 +0000
+  EndTime: Oct 06, 2021 18:00 +0000
+  CreatedTime: Oct 03, 2021 15:14 +0000
+  ResourceName: OU_OSCER_ATLAS
+  Services:
+  - CE
+  - GridFtp
+# ---------------------------------------------------------