diff --git a/Package.swift b/Package.swift
index 5d08997e0..6a86f6774 100644
--- a/Package.swift
+++ b/Package.swift
@@ -198,7 +198,7 @@ let package = Package(
         "_Testing_CoreGraphics",
       ],
       path: "Sources/Overlays/_Testing_AppKit",
-      swiftSettings: .packageSettings
+      swiftSettings: .packageSettings + .enableLibraryEvolution()
     ),
     .target(
       name: "_Testing_CoreGraphics",
diff --git a/Sources/Overlays/_Testing_AppKit/Attachments/NSImage+AttachableAsCGImage.swift b/Sources/Overlays/_Testing_AppKit/Attachments/NSImage+AttachableAsCGImage.swift
index 529dfc724..7e5c9363d 100644
--- a/Sources/Overlays/_Testing_AppKit/Attachments/NSImage+AttachableAsCGImage.swift
+++ b/Sources/Overlays/_Testing_AppKit/Attachments/NSImage+AttachableAsCGImage.swift
@@ -10,7 +10,7 @@
 
 #if SWT_TARGET_OS_APPLE && canImport(AppKit)
 public import AppKit
-@_spi(ForSwiftTestingOnly) @_spi(Experimental) public import _Testing_CoreGraphics
+@_spi(Experimental) public import _Testing_CoreGraphics
 
 @_spi(Experimental)
 extension NSImage: AttachableAsCGImage {