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 023661a50..6c639eceb 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	
@@ -697,3 +697,27 @@
   - CE
   - GridFtp
 # ---------------------------------------------------------
+- Class: SCHEDULED
+  ID: 1616676468
+  Description: SLURM and core network upgrades
+  Severity: Outage
+  StartTime: Oct 11, 2023 13:00 +0000
+  EndTime: Oct 12, 2023 04:00 +0000
+  CreatedTime: Oct 07, 2023 08:34 +0000
+  ResourceName: OU_OSCER_ATLAS
+  Services:
+  - CE
+  - GridFtp
+# ---------------------------------------------------------
+- Class: SCHEDULED
+  ID: 1616676469
+  Description: SLURM and core network upgrades
+  Severity: Outage
+  StartTime: Oct 11, 2023 13:00 +0000
+  EndTime: Oct 12, 2023 04:00 +0000
+  CreatedTime: Oct 07, 2023 08:34 +0000
+  ResourceName: OU_OSCER_ATLAS_SE
+  Services:
+  - GridFtp
+  - XRootD component
+# ---------------------------------------------------------