diff --git a/Package.swift b/Package.swift
index db7ec868..758aa8d6 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// 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.
 
@@ -6,6 +6,12 @@ import PackageDescription
 
 let package = Package(
   name: "CoreXLSX",
+  platforms: [
+    .macOS(.v10_11),
+    .iOS(.v9),
+    .tvOS(.v9),
+    .watchOS(.v2)
+  ],
   products: [
     // Products define the executables and libraries produced by a package,
     // and make them visible to other packages.
diff --git a/Package@swift-4.2.swift b/Package@swift-4.2.swift
new file mode 100644
index 00000000..db7ec868
--- /dev/null
+++ b/Package@swift-4.2.swift
@@ -0,0 +1,39 @@
+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to
+// build this package.
+
+import PackageDescription
+
+let package = Package(
+  name: "CoreXLSX",
+  products: [
+    // Products define the executables and libraries produced by a package,
+    // and make them visible to other packages.
+    .library(
+      name: "CoreXLSX",
+      targets: ["CoreXLSX"]
+    ),
+  ],
+  dependencies: [
+    // Dependencies declare other packages that this package depends on.
+    // .package(url: /* package url */, from: "1.0.0"),
+    .package(url: "https://github.com/maxdesiatov/XMLCoder.git",
+             .upToNextMajor(from: "0.4.0")),
+    .package(url: "https://github.com/weichsel/ZIPFoundation.git",
+             .upToNextMajor(from: "0.9.8")),
+  ],
+  targets: [
+    // Targets are the basic building blocks of a package. A target can define
+    // a module or a test suite.
+    // Targets can depend on other targets in this package, and on products in
+    // packages which this package depends on.
+    .target(
+      name: "CoreXLSX",
+      dependencies: ["XMLCoder", "ZIPFoundation"]
+    ),
+    .testTarget(
+      name: "CoreXLSXTests",
+      dependencies: ["CoreXLSX"]
+    ),
+  ]
+)