diff --git a/.gitignore b/.gitignore
index 89b6978..08d6ef8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 JSONWebToken.xcodeproj/xcuserdata
+.swiftpm/xcode/xcuserdata
diff --git a/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/.swiftpm/xcode/xcshareddata/xcschemes/JSONWebToken.xcscheme b/.swiftpm/xcode/xcshareddata/xcschemes/JSONWebToken.xcscheme
new file mode 100644
index 0000000..86e5224
--- /dev/null
+++ b/.swiftpm/xcode/xcshareddata/xcschemes/JSONWebToken.xcscheme
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1140"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "JSONWebToken"
+               BuildableName = "JSONWebToken"
+               BlueprintName = "JSONWebToken"
+               ReferencedContainer = "container:">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "JSONWebToken"
+            BuildableName = "JSONWebToken"
+            BlueprintName = "JSONWebToken"
+            ReferencedContainer = "container:">
+         </BuildableReference>
+      </MacroExpansion>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>
diff --git a/JSONWebToken.xcodeproj/project.pbxproj b/JSONWebToken.xcodeproj/project.pbxproj
index ab95736..545a57b 100644
--- a/JSONWebToken.xcodeproj/project.pbxproj
+++ b/JSONWebToken.xcodeproj/project.pbxproj
@@ -183,7 +183,7 @@
 		7148BE9C1BFE2FA400CD17E7 /* TestUtils.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestUtils.swift; sourceTree = "<group>"; };
 		7148BEA01BFF0B0B00CD17E7 /* SecKeyUtils.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SecKeyUtils.swift; sourceTree = "<group>"; };
 		7148BEA21BFF6FF500CD17E7 /* ClaimValidator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ClaimValidator.swift; sourceTree = "<group>"; };
-		71642F3A1D9BB138008BBA95 /* JSONWebToken.entitlements */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.entitlements; path = JSONWebToken.entitlements; sourceTree = "<group>"; };
+		71642F3A1D9BB138008BBA95 /* JSONWebToken.entitlements */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.entitlements; name = JSONWebToken.entitlements; path = ../JSONWebToken/JSONWebToken.entitlements; sourceTree = "<group>"; };
 		71642F3F1D9BB1F2008BBA95 /* TestContainer.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = TestContainer.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		71642F411D9BB1F2008BBA95 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		71642F431D9BB1F2008BBA95 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -192,8 +192,8 @@
 		71642F4B1D9BB1F2008BBA95 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		71642F4D1D9BB1F2008BBA95 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		717ACFCE1BFB6842004E01D0 /* JSONWebToken.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = JSONWebToken.framework; sourceTree = BUILT_PRODUCTS_DIR; };
-		717ACFD11BFB6842004E01D0 /* JSONWebToken.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = JSONWebToken.h; sourceTree = "<group>"; };
-		717ACFD31BFB6842004E01D0 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		717ACFD11BFB6842004E01D0 /* JSONWebToken.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = JSONWebToken.h; path = JSONWebToken/JSONWebToken.h; sourceTree = "<group>"; };
+		717ACFD31BFB6842004E01D0 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; name = Info.plist; path = JSONWebToken/Info.plist; sourceTree = "<group>"; };
 		717ACFD81BFB6842004E01D0 /* JSONWebTokenTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = JSONWebTokenTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
 		717ACFDD1BFB6842004E01D0 /* RSASSA_PKCS1Tests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RSASSA_PKCS1Tests.swift; sourceTree = "<group>"; };
 		717ACFDF1BFB6842004E01D0 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
@@ -312,6 +312,7 @@
 		71642F401D9BB1F2008BBA95 /* TestContainer */ = {
 			isa = PBXGroup;
 			children = (
+				71642F3A1D9BB138008BBA95 /* JSONWebToken.entitlements */,
 				71642F411D9BB1F2008BBA95 /* AppDelegate.swift */,
 				71642F431D9BB1F2008BBA95 /* ViewController.swift */,
 				71642F451D9BB1F2008BBA95 /* Main.storyboard */,
@@ -325,6 +326,8 @@
 		717ACFC41BFB6842004E01D0 = {
 			isa = PBXGroup;
 			children = (
+				717ACFD11BFB6842004E01D0 /* JSONWebToken.h */,
+				717ACFD31BFB6842004E01D0 /* Info.plist */,
 				717ACFD01BFB6842004E01D0 /* JSONWebToken */,
 				717ACFDC1BFB6842004E01D0 /* JSONWebTokenTests */,
 				719156991D1D3BE900FC55C9 /* JSONWebToken tvOS */,
@@ -349,8 +352,6 @@
 		717ACFD01BFB6842004E01D0 /* JSONWebToken */ = {
 			isa = PBXGroup;
 			children = (
-				717ACFD11BFB6842004E01D0 /* JSONWebToken.h */,
-				717ACFD31BFB6842004E01D0 /* Info.plist */,
 				717ACFE81BFB69EB004E01D0 /* JSONWebToken.swift */,
 				717ACFFE1BFC8393004E01D0 /* SignatureAlgorithm.swift */,
 				71EA699E1C0323320081AF85 /* TokenSigner.swift */,
@@ -360,9 +361,9 @@
 				71AF7F482474191A00DDF6C0 /* Data+hash.swift */,
 				717ACFF41BFB8113004E01D0 /* NSData+Base64URLEncoding.swift */,
 				7148BEA01BFF0B0B00CD17E7 /* SecKeyUtils.swift */,
-				71642F3A1D9BB138008BBA95 /* JSONWebToken.entitlements */,
 			);
-			path = JSONWebToken;
+			name = JSONWebToken;
+			path = Sources/JSONWebToken;
 			sourceTree = "<group>";
 		};
 		717ACFDC1BFB6842004E01D0 /* JSONWebTokenTests */ = {
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..6102e29
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,28 @@
+// swift-tools-version:5.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "JSONWebToken",
+    platforms: [
+        .iOS(.v12), .tvOS(.v12)
+    ],
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "JSONWebToken",
+            targets: ["JSONWebToken"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    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: "JSONWebToken",
+            dependencies: []),
+    ]
+)
diff --git a/JSONWebToken/ClaimValidator.swift b/Sources/JSONWebToken/ClaimValidator.swift
similarity index 100%
rename from JSONWebToken/ClaimValidator.swift
rename to Sources/JSONWebToken/ClaimValidator.swift
diff --git a/JSONWebToken/Data+hash.swift b/Sources/JSONWebToken/Data+hash.swift
similarity index 96%
rename from JSONWebToken/Data+hash.swift
rename to Sources/JSONWebToken/Data+hash.swift
index bc6e793..f0171dd 100644
--- a/JSONWebToken/Data+hash.swift
+++ b/Sources/JSONWebToken/Data+hash.swift
@@ -11,7 +11,7 @@ import CryptoKit
 
 extension Data {
     func sha(_ hashFunction: SignatureAlgorithm.HashFunction) -> Data {
-        if #available(iOSApplicationExtension 13.0, *) {
+        if #available(iOS 13.0, *) {
             switch hashFunction {
             case .sha256: return Data(SHA256.hash(data: self))
             case .sha384: return Data(SHA384.hash(data: self))
@@ -40,7 +40,7 @@ extension Data {
         }
     }
     func hmac(_ hashFunction: SignatureAlgorithm.HashFunction, secret: Data) -> Data {
-        if #available(iOSApplicationExtension 13.0, *) {
+        if #available(iOS 13.0, *) {
             let key = SymmetricKey(data: secret)
             switch hashFunction {
             case .sha256:
diff --git a/JSONWebToken/HMAC.swift b/Sources/JSONWebToken/HMAC.swift
similarity index 100%
rename from JSONWebToken/HMAC.swift
rename to Sources/JSONWebToken/HMAC.swift
diff --git a/JSONWebToken/JSONWebToken.swift b/Sources/JSONWebToken/JSONWebToken.swift
similarity index 100%
rename from JSONWebToken/JSONWebToken.swift
rename to Sources/JSONWebToken/JSONWebToken.swift
diff --git a/JSONWebToken/NSData+Base64URLEncoding.swift b/Sources/JSONWebToken/NSData+Base64URLEncoding.swift
similarity index 100%
rename from JSONWebToken/NSData+Base64URLEncoding.swift
rename to Sources/JSONWebToken/NSData+Base64URLEncoding.swift
diff --git a/JSONWebToken/RSASSA_PKCS1.swift b/Sources/JSONWebToken/RSASSA_PKCS1.swift
similarity index 100%
rename from JSONWebToken/RSASSA_PKCS1.swift
rename to Sources/JSONWebToken/RSASSA_PKCS1.swift
diff --git a/JSONWebToken/SecKeyUtils.swift b/Sources/JSONWebToken/SecKeyUtils.swift
similarity index 100%
rename from JSONWebToken/SecKeyUtils.swift
rename to Sources/JSONWebToken/SecKeyUtils.swift
diff --git a/JSONWebToken/SignatureAlgorithm.swift b/Sources/JSONWebToken/SignatureAlgorithm.swift
similarity index 100%
rename from JSONWebToken/SignatureAlgorithm.swift
rename to Sources/JSONWebToken/SignatureAlgorithm.swift
diff --git a/JSONWebToken/SignatureValidator.swift b/Sources/JSONWebToken/SignatureValidator.swift
similarity index 100%
rename from JSONWebToken/SignatureValidator.swift
rename to Sources/JSONWebToken/SignatureValidator.swift
diff --git a/JSONWebToken/TokenSigner.swift b/Sources/JSONWebToken/TokenSigner.swift
similarity index 100%
rename from JSONWebToken/TokenSigner.swift
rename to Sources/JSONWebToken/TokenSigner.swift
diff --git a/JSONWebToken/TokenValidator.swift b/Sources/JSONWebToken/TokenValidator.swift
similarity index 100%
rename from JSONWebToken/TokenValidator.swift
rename to Sources/JSONWebToken/TokenValidator.swift