diff --git a/windows/security/operating-system.md b/windows/security/operating-system.md
index 9c4e6c86ea..c231c53e4b 100644
--- a/windows/security/operating-system.md
+++ b/windows/security/operating-system.md
@@ -12,7 +12,7 @@ author: denisebmsft
 ms.collection: M365-security-compliance
 ms.prod: m365-security
 ms.technology: windows-sec
-ms.date: 
+ms.date: 09/21/2021
 ---
 
 # Windows operating system security