diff --git a/.pipelines/ESRPSigning_core.json b/.pipelines/ESRPSigning_core.json
index c419d1b588..83289fa102 100644
--- a/.pipelines/ESRPSigning_core.json
+++ b/.pipelines/ESRPSigning_core.json
@@ -291,6 +291,7 @@
                 "Mono.Cecil.Rocks.dll",
                 "Newtonsoft.Json.dll",
                 "CommunityToolkit.WinUI.Controls.TitleBar.dll",
+                "CommunityToolkit.WinUI.Controls.OpacityMaskView.dll",
 
                 "NLog.dll",
                 "HtmlAgilityPack.dll",