diff --git a/Package.swift b/Package.swift
index acf6c06..5fe16f8 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.7
+// swift-tools-version: 5.8
 
 import PackageDescription
 
@@ -27,6 +27,9 @@ let package = Package(
             dependencies: [
                 .product(name: "KeyPathValue", package: "KeyPathValue")
             ],
+            swiftSettings: [
+                .enableUpcomingFeature("ExistentialAny", .when(configuration: .debug))
+            ],
             plugins: []
         ),
         .target(
diff --git a/Sources/AppContainer/AppContainer.swift b/Sources/AppContainer/AppContainer.swift
index 99642ca..a1aff81 100644
--- a/Sources/AppContainer/AppContainer.swift
+++ b/Sources/AppContainer/AppContainer.swift
@@ -6,7 +6,7 @@ public class AppContainer {
     /// standard container manager
     public static let standard = AppContainer()
 
-    public var delegates: WeakHashTable<AppContainerDelegate> = .init()
+    public var delegates: WeakHashTable<any AppContainerDelegate> = .init()
 
     private let fileManager = FileManager.default