diff --git a/.gitignore b/.gitignore
index 27df659..48a5272 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,8 +36,7 @@ playground.xcworkspace
 # Swift Package Manager
 #
 # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
-# Packages/
-# Package.pins
+.swiftpm/
 .build/
 
 # CocoaPods
diff --git a/CodableKeychain.podspec b/CodableKeychain.podspec
index b25636c..062a351 100644
--- a/CodableKeychain.podspec
+++ b/CodableKeychain.podspec
@@ -13,6 +13,7 @@ Pod::Spec.new do |s|
   s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.0'
+  s.swift_versions = ['4.2', '5.0']
 
   s.source_files = 'Sources/*.swift'
 end
diff --git a/Package.swift b/Package.swift
index 3b2abf4..232d57f 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,3 +1,4 @@
+// swift-tools-version:5.0
 //
 //  Package.swift
 //
@@ -24,4 +25,29 @@
 
 import PackageDescription
 
-let package = Package(name: "CodableKeychain", dependencies: [], exclude: ["Tests", "MobileHost"])
+let package = Package(
+    name: "CodableKeychain",
+    platforms: [
+        .iOS(.v9),
+        .tvOS(.v9),
+        .macOS(.v10_10),
+        .watchOS(.v2)
+    ],
+    products: [
+        .library(
+            name: "CodableKeychain",
+            targets: ["CodableKeychain"]
+        )
+    ],
+    targets: [
+        .target(
+            name: "CodableKeychain",
+            path: "Sources",
+            exclude: ["Info.plist"]
+        )
+    ],
+    swiftLanguageVersions: [
+        .v4_2,
+        .v5
+    ]
+)
diff --git a/Package@swift-4.2.swift b/Package@swift-4.2.swift
new file mode 100644
index 0000000..c0c4b40
--- /dev/null
+++ b/Package@swift-4.2.swift
@@ -0,0 +1,43 @@
+// swift-tools-version:4.2
+//
+//  Package.swift
+//
+//  Copyright (c) 2017 Todd Kramer (http://www.tekramer.com)
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+//
+
+import PackageDescription
+
+let package = Package(
+    name: "CodableKeychain",
+    products: [
+        .library(
+            name: "CodableKeychain",
+            targets: ["CodableKeychain"]
+        )
+    ],
+    targets: [
+        .target(
+            name: "CodableKeychain",
+            path: "Sources",
+            exclude: ["Info.plist"]
+        )
+    ]
+)
diff --git a/README.md b/README.md
index 96b58a8..2b253ec 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # CodableKeychain
 
-![CocoaPods Version](https://cocoapod-badges.herokuapp.com/v/CodableKeychain/badge.png) [![Swift](https://img.shields.io/badge/swift-4.2-orange.svg?style=flat)](https://developer.apple.com/swift/) ![Platform](https://cocoapod-badges.herokuapp.com/p/CodableKeychain/badge.png) [![Swift Package Manager compatible](https://img.shields.io/badge/SPM-compatible-4BC51D.svg?style=flat)](https://github.com/apple/swift-package-manager) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
+![CocoaPods Version](https://cocoapod-badges.herokuapp.com/v/CodableKeychain/badge.png) [![Swift](https://img.shields.io/badge/swift-5.0_4.2-orange.svg?style=flat)](https://developer.apple.com/swift/) ![Platform](https://cocoapod-badges.herokuapp.com/p/CodableKeychain/badge.png) [![Swift Package Manager compatible](https://img.shields.io/badge/SPM-compatible-4BC51D.svg?style=flat)](https://github.com/apple/swift-package-manager) [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 
 ## Overview
 
@@ -83,7 +83,7 @@ do {
 
 ## Installation
 
-> _Note:_ CodableKeychain requires Swift 4 (and [Xcode][] 9) or greater.
+> _Note:_ CodableKeychain requires Swift 4.2 (and [Xcode][] 10) or greater.
 >
 > Targets using CodableKeychain must support embedded Swift frameworks.