diff --git a/git-hooks/commit-msg.ps1 b/git-hooks/commit-msg.ps1
index 9636f8e..4da51dc 100644
--- a/git-hooks/commit-msg.ps1
+++ b/git-hooks/commit-msg.ps1
@@ -8,6 +8,7 @@
 #   Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
 #   Co-authored-by: GitHub Copilot <noreply@github.com>
 #   Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
+#   Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
 #   Co-authored-by: Amazon Q <q@amazon.com>
 #   Generated-by: GitHub Copilot
 
diff --git a/git-hooks/tests/commit-msg.Tests.ps1 b/git-hooks/tests/commit-msg.Tests.ps1
index 4180824..52dd51f 100644
--- a/git-hooks/tests/commit-msg.Tests.ps1
+++ b/git-hooks/tests/commit-msg.Tests.ps1
@@ -126,6 +126,13 @@ Describe 'Remove-AITrailers' {
             $result | Should -Not -Match 'Co-authored-by'
             $result[0] | Should -Be 'Fix bug'
         }
+
+        It 'removes Co-authored-by: Copilot App with GitHub noreply bot email' {
+            $lines = @('Fix bug', '', 'Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>')
+            $result = @(Remove-AITrailers -Lines $lines)
+            $result | Should -Not -Match 'Co-authored-by'
+            $result[0] | Should -Be 'Fix bug'
+        }
     }
 
     Context 'Claude / Anthropic Co-authored-by is removed' {
@@ -418,6 +425,13 @@ Describe 'commit-msg bash hook (end-to-end)' -Skip:($IsWindows -or -not (Get-Com
         $result.Trim() | Should -Be 'Fix bug'
     }
 
+    It 'removes Copilot App trailer with GitHub noreply bot email' {
+        $content = "Fix bug`n`nCo-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>`n"
+        $result = Invoke-BashHook $content
+        $result | Should -Not -Match 'Co-authored-by'
+        $result.Trim() | Should -Be 'Fix bug'
+    }
+
     It 'removes Claude trailer by email domain' {
         $content = "Fix bug`n`nCo-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>`n"
         $result = Invoke-BashHook $content