diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index 9c8a4cf..3c2c45e 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -298,11 +298,18 @@ jobs:
               & "$env:MAGE" -Sign "$appFilesDir/MarcusLaw.OutlookAddin.dll.manifest" -CertHash $thumb -TimeStampUri http://timestamp.digicert.com
               if ($LASTEXITCODE -ne 0) { throw "mage -Sign app manifest failed" }
 
-              Copy-Item "$appFilesDir/MarcusLaw.OutlookAddin.dll.manifest" "$publishDir/OutlookAddin.vsto"
-              & "$env:MAGE" -Update "$publishDir/OutlookAddin.vsto" `
+              # Create the deployment manifest (.vsto) directly via -New Deployment.
+              # Don't copy-then-Update -- mage rejects an Application manifest fed
+              # to -Update because the schema differs.
+              & "$env:MAGE" -New Deployment `
+                  -ToFile      "$publishDir/OutlookAddin.vsto" `
+                  -Name        "Marcus-Law OutlookAddin" `
+                  -Version     $version `
                   -AppManifest "$appFilesDir/MarcusLaw.OutlookAddin.dll.manifest" `
-                  -ProviderUrl "$env:PROVIDER_URL" -Publisher "Marcus-Law" -Install true
-              if ($LASTEXITCODE -ne 0) { throw "mage -Update deployment manifest failed" }
+                  -ProviderUrl "$env:PROVIDER_URL" `
+                  -Publisher   "Marcus-Law" `
+                  -Install     true
+              if ($LASTEXITCODE -ne 0) { throw "mage -New Deployment failed" }
 
               & "$env:MAGE" -Sign "$publishDir/OutlookAddin.vsto" -CertHash $thumb -TimeStampUri http://timestamp.digicert.com
               if ($LASTEXITCODE -ne 0) { throw "mage -Sign deployment manifest failed" }