diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f64edae
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,25 @@
+name: CI
+on:
+  pull_request:
+jobs:
+  build:
+    runs-on: ${{ matrix.xcode == '11' && 'macos-10.15' || 'macos-11' }}
+    strategy:
+      matrix:
+        platform:
+          - macOS
+          - tvOS
+          - iOS
+          - watchOS
+        xcode:
+          - 11
+          - 12
+          - 13
+    steps:
+    - uses: actions/checkout@v2
+    - run: rm -rf PMKStoreKit.xcodeproj
+    - uses: mxcl/xcodebuild@v1
+      with:
+        xcode: ${{ matrix.xcode }}
+        platform: ${{ matrix.platform }}
+        action: build
diff --git a/.gitignore b/.gitignore
index bec9c17..a20bdc5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 *.xcscmblueprint
 /Carthage
 /.build
-.DS_Store
\ No newline at end of file
+.DS_Store
+/Package.resolved
diff --git a/Package.swift b/Package.swift
index 32552be..302e2d3 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,23 +1,26 @@
-// swift-tools-version:4.0
+// swift-tools-version:5.0
 import PackageDescription
 
 let name = "PMKStoreKit"
 
 let pkg = Package(name: name)
+pkg.platforms = [
+  .watchOS("6.2")
+]
 pkg.products = [
-    .library(name: name, targets: [name]),
+  .library(name: name, targets: [name]),
 ]
-pkg.swiftLanguageVersions = [3, 4]
+pkg.swiftLanguageVersions = [.v4, .v5]
 pkg.dependencies = [
-	.package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.0.0")
+  .package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.0.0")
 ]
 
 let target: Target = .target(name: name)
 target.path = "Sources"
 target.exclude = [
   "SKRequest+AnyPromise.h",
-	"SKRequest+AnyPromise.m",
-	"\(name).h",
+  "SKRequest+AnyPromise.m",
+  "\(name).h",
 ]
 target.dependencies = ["PromiseKit"]
 
diff --git a/Package@swift-4.0.swift b/Package@swift-4.0.swift
new file mode 100644
index 0000000..32552be
--- /dev/null
+++ b/Package@swift-4.0.swift
@@ -0,0 +1,24 @@
+// swift-tools-version:4.0
+import PackageDescription
+
+let name = "PMKStoreKit"
+
+let pkg = Package(name: name)
+pkg.products = [
+    .library(name: name, targets: [name]),
+]
+pkg.swiftLanguageVersions = [3, 4]
+pkg.dependencies = [
+	.package(url: "https://github.com/mxcl/PromiseKit.git", from: "6.0.0")
+]
+
+let target: Target = .target(name: name)
+target.path = "Sources"
+target.exclude = [
+  "SKRequest+AnyPromise.h",
+	"SKRequest+AnyPromise.m",
+	"\(name).h",
+]
+target.dependencies = ["PromiseKit"]
+
+pkg.targets = [target]
diff --git a/Package@4.2.swift b/Package@swift-4.2.swift
similarity index 100%
rename from Package@4.2.swift
rename to Package@swift-4.2.swift