diff --git a/Package.swift b/Package.swift
index 415fa0a..7c99b84 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.7
+// swift-tools-version: 6.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
   name: "AsyncMultiplexImage",
   platforms: [
-    .iOS(.v15),
+    .iOS(.v16),
   ],
   products: [
     // Products define the executables and libraries a package produces, and make them visible to other packages.
@@ -46,5 +46,6 @@ let package = Package(
       name: "AsyncMultiplexImageTests",
       dependencies: ["AsyncMultiplexImage"]
     ),
-  ]
+  ],
+  swiftLanguageModes: [.v6]
 )
diff --git a/Sources/AsyncMultiplexImage/AsyncMultiplexImage.swift b/Sources/AsyncMultiplexImage/AsyncMultiplexImage.swift
index 57d177d..d4f5edf 100644
--- a/Sources/AsyncMultiplexImage/AsyncMultiplexImage.swift
+++ b/Sources/AsyncMultiplexImage/AsyncMultiplexImage.swift
@@ -88,7 +88,7 @@ public enum AsyncMultiplexImagePhase {
   case failure(Error)
 }
 
-public struct AsyncMultiplexImageCandidate: Hashable {
+public struct AsyncMultiplexImageCandidate: Hashable, Sendable {
 
   public let index: Int
   public let urlRequest: URLRequest
diff --git a/Sources/AsyncMultiplexImageDemo/Demo.swift b/Sources/AsyncMultiplexImageDemo/Demo.swift
index c119885..046e6bf 100644
--- a/Sources/AsyncMultiplexImageDemo/Demo.swift
+++ b/Sources/AsyncMultiplexImageDemo/Demo.swift
@@ -96,6 +96,8 @@ struct BookAlign: View, PreviewProvider {
               .overlay(Text("Done"))
           case .failure(let error):
             Text("Error")
+          @unknown default:
+            EmptyView()
           }
         }
       }