diff --git a/Package.swift b/Package.swift
index f0b256b..bc04bc1 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,13 +1,13 @@
-//
-//  Package.swift
-//  SwiftState
-//
-//  Created by Yasuhiro Inami on 2015-12-05.
-//  Copyright © 2015 Yasuhiro Inami. All rights reserved.
-//
-
+// swift-tools-version:5.1
 import PackageDescription
 
 let package = Package(
-    name: "SwiftState"
+    name: "SwiftState",
+    platforms: [.iOS(.v11)],
+    products: [
+       .library(name: "SwiftState", targets: ["SwiftState"])
+    ],
+    targets: [
+       .target(name: "SwiftState", path: "Sources")
+    ]
 )