diff --git a/AltStore/Operations/ResignAppOperation.swift b/AltStore/Operations/ResignAppOperation.swift
index bd0fc041..571021a9 100644
--- a/AltStore/Operations/ResignAppOperation.swift
+++ b/AltStore/Operations/ResignAppOperation.swift
@@ -220,6 +220,14 @@ private extension ResignAppOperation
                 {
                     for case let fileURL as URL in enumerator
                     {
+                        #if DEBUG
+                        guard !fileURL.lastPathComponent.lowercased().contains(".xctest") else {
+                            // Remove embedded XCTest (+ dSYM) bundle from copied app bundle.
+                            try FileManager.default.removeItem(at: fileURL)
+                            continue
+                        }
+                        #endif
+                        
                         guard let appExtension = Bundle(url: fileURL) else { throw ALTError(.missingAppBundle) }
                         try prepare(appExtension)
                     }
diff --git a/Dependencies/AltSign b/Dependencies/AltSign
index 76ee2abb..3f300e4e 160000
--- a/Dependencies/AltSign
+++ b/Dependencies/AltSign
@@ -1 +1 @@
-Subproject commit 76ee2abb125d9e5598826660038ba894f3c4f23e
+Subproject commit 3f300e4ed8e4bbbc050cca88125269007d8ebf9f