diff --git a/Package.swift b/Package.swift
index e0541cf..8267877 100755
--- a/Package.swift
+++ b/Package.swift
@@ -1,13 +1,19 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 import PackageDescription
 
 let package = Package(
     name: "Watchdog",
+    platforms: [
+        .iOS(.v8),
+        .macOS("10.9"),
+        .tvOS(.v9)
+    ],
     products: [
         .library(name: "Watchdog", targets: ["Watchdog"]),
     ],
     targets: [
         .target(name: "Watchdog", path: "Classes"),
-    ]
+    ],
+    swiftLanguageVersions: [.v5]
 )