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 edc5ddc45..fa5116dcf 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	
@@ -685,3 +685,15 @@
   - GridFtp
   - XRootD component
 # ---------------------------------------------------------
+- Class: SCHEDULED
+  ID: 1546161183
+  Description: SLURM upgrade
+  Severity: Outage
+  StartTime: Jul 19, 2023 13:00 +0000
+  EndTime: Jul 20, 2023 04:00 +0000
+  CreatedTime: Jul 17, 2023 17:48 +0000
+  ResourceName: OU_OSCER_ATLAS
+  Services:
+  - CE
+  - GridFtp
+# ---------------------------------------------------------