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/Package.resolved b/Package.resolved
new file mode 100644
index 0000000..9e8c8d4
--- /dev/null
+++ b/Package.resolved
@@ -0,0 +1,61 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "Chalk",
+        "repositoryURL": "https://github.com/mxcl/Chalk.git",
+        "state": {
+          "branch": null,
+          "revision": "9aa9f348b86db3cf6702a3e43c081ecec80cf3c7",
+          "version": "0.4.0"
+        }
+      },
+      {
+        "package": "FileCheck",
+        "repositoryURL": "https://github.com/llvm-swift/FileCheck.git",
+        "state": {
+          "branch": null,
+          "revision": "0dc8a5bff1a7f01e1d7bcc20c79e2127b2ea3eeb",
+          "version": "0.2.5"
+        }
+      },
+      {
+        "package": "Nimble",
+        "repositoryURL": "https://github.com/Quick/Nimble.git",
+        "state": {
+          "branch": null,
+          "revision": "7a46a5fc86cb917f69e3daf79fcb045283d8f008",
+          "version": "8.1.2"
+        }
+      },
+      {
+        "package": "Quick",
+        "repositoryURL": "https://github.com/Quick/Quick.git",
+        "state": {
+          "branch": null,
+          "revision": "09b3becb37cb2163919a3842a4c5fa6ec7130792",
+          "version": "2.2.1"
+        }
+      },
+      {
+        "package": "swift-argument-parser",
+        "repositoryURL": "https://github.com/apple/swift-argument-parser",
+        "state": {
+          "branch": null,
+          "revision": "9564d61b08a5335ae0a36f789a7d71493eacadfc",
+          "version": "0.3.2"
+        }
+      },
+      {
+        "package": "SwiftCheck",
+        "repositoryURL": "https://github.com/typelift/SwiftCheck.git",
+        "state": {
+          "branch": null,
+          "revision": "077c096c3ddfc38db223ac8e525ad16ffb987138",
+          "version": "0.12.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}
diff --git a/Package.swift b/Package.swift
new file mode 100644
index 0000000..8f4fb50
--- /dev/null
+++ b/Package.swift
@@ -0,0 +1,34 @@
+// swift-tools-version:5.3
+import PackageDescription
+
+let package = Package(
+    name: "TrueTime",
+    products: [
+        .library(
+            name: "TrueTime",
+            targets: ["TrueTime"]),
+        .library(
+            name: "CTrueTime",
+            targets: ["CTrueTime"])
+    ],
+    dependencies: [
+        .package(url: "https://github.com/Quick/Nimble.git", .upToNextMajor(from: "8.0.1")),
+        .package(url: "https://github.com/Quick/Quick.git", .upToNextMajor(from: "2.1.0")),
+        .package(url: "https://github.com/typelift/SwiftCheck.git", .upToNextMajor(from: "0.12.0")),
+    ],
+    targets: [
+        .target(
+            name: "TrueTime",
+            dependencies: ["CTrueTime"]),
+        .testTarget(
+            name: "TrueTimeTests",
+            dependencies: [
+                "TrueTime", 
+                "Quick", 
+                "Nimble", 
+                "SwiftCheck"
+            ]
+        ),
+        .systemLibrary(name: "CTrueTime")
+    ]
+)
diff --git a/Sources/TrueTime.h b/Sources/TrueTime.h
deleted file mode 100644
index a9b09ab..0000000
--- a/Sources/TrueTime.h
+++ /dev/null
@@ -1,26 +0,0 @@
-//
-//  TrueTime.h
-//  TrueTime
-//
-//  Created by Michael Sanders on 7/9/16.
-//  Copyright © 2016 Instacart. All rights reserved.
-//
-
-@import Foundation;
-#import "ntp_types.h"
-
-NS_ASSUME_NONNULL_BEGIN
-
-//! Project version number for TrueTime.
-FOUNDATION_EXPORT double TrueTimeVersionNumber;
-
-//! Project version string for TrueTime.
-FOUNDATION_EXPORT const unsigned char TrueTimeVersionNumberString[];
-
-//! Domain for TrueTime errors.
-FOUNDATION_EXPORT NSString * const TrueTimeErrorDomain;
-
-//! Notification sent whenever a TrueTimeClient's reference time is updated.
-FOUNDATION_EXPORT NSString * const TrueTimeUpdatedNotification;
-
-NS_ASSUME_NONNULL_END
diff --git a/Sources/TrueTime.m b/Sources/TrueTime.m
deleted file mode 100644
index a8f2647..0000000
--- a/Sources/TrueTime.m
+++ /dev/null
@@ -1,12 +0,0 @@
-//
-//  TrueTime.m
-//  TrueTime
-//
-//  Created by Michael Sanders on 8/15/16.
-//  Copyright © 2016 Instacart. All rights reserved.
-//
-
-#import "TrueTime.h"
-
-NSString * const TrueTimeErrorDomain = @"com.instacart.TrueTimeErrorDomain";
-NSString * const TrueTimeUpdatedNotification = @"TrueTimeUpdatedNotification";
diff --git a/Sources/Endian.swift b/Sources/TrueTime/Endian.swift
similarity index 99%
rename from Sources/Endian.swift
rename to Sources/TrueTime/Endian.swift
index 348fa59..c65c8e4 100644
--- a/Sources/Endian.swift
+++ b/Sources/TrueTime/Endian.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import CTrueTime
 
 protocol NetworkOrderConvertible {
     var byteSwapped: Self { get }
diff --git a/Sources/GCDLock.swift b/Sources/TrueTime/GCDLock.swift
similarity index 100%
rename from Sources/GCDLock.swift
rename to Sources/TrueTime/GCDLock.swift
diff --git a/Sources/HostResolver.swift b/Sources/TrueTime/HostResolver.swift
similarity index 100%
rename from Sources/HostResolver.swift
rename to Sources/TrueTime/HostResolver.swift
diff --git a/Sources/Info.plist b/Sources/TrueTime/Info.plist
similarity index 100%
rename from Sources/Info.plist
rename to Sources/TrueTime/Info.plist
diff --git a/Sources/NTPClient.swift b/Sources/TrueTime/NTPClient.swift
similarity index 99%
rename from Sources/NTPClient.swift
rename to Sources/TrueTime/NTPClient.swift
index e340749..77fa64e 100644
--- a/Sources/NTPClient.swift
+++ b/Sources/TrueTime/NTPClient.swift
@@ -6,6 +6,9 @@
 //  Copyright © 2016 Instacart. All rights reserved.
 //
 
+import Foundation
+import CTrueTime
+
 struct NTPConfig {
     let timeout: TimeInterval
     let maxRetries: Int
diff --git a/Sources/NTPConnection.swift b/Sources/TrueTime/NTPConnection.swift
similarity index 99%
rename from Sources/NTPConnection.swift
rename to Sources/TrueTime/NTPConnection.swift
index 2606da3..7d02df0 100644
--- a/Sources/NTPConnection.swift
+++ b/Sources/TrueTime/NTPConnection.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import CTrueTime
 
 typealias NTPConnectionCallback = (NTPConnection, FrozenNetworkTimeResult) -> Void
 
diff --git a/Sources/NTPExtensions.swift b/Sources/TrueTime/NTPExtensions.swift
similarity index 99%
rename from Sources/NTPExtensions.swift
rename to Sources/TrueTime/NTPExtensions.swift
index c7d5088..7a94f79 100644
--- a/Sources/NTPExtensions.swift
+++ b/Sources/TrueTime/NTPExtensions.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import CTrueTime
 
 public extension timeval {
     static func uptime() -> timeval {
diff --git a/Sources/NTPResponse.swift b/Sources/TrueTime/NTPResponse.swift
similarity index 99%
rename from Sources/NTPResponse.swift
rename to Sources/TrueTime/NTPResponse.swift
index b9bc6d9..c3b2f72 100644
--- a/Sources/NTPResponse.swift
+++ b/Sources/TrueTime/NTPResponse.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import CTrueTime
 
 struct NTPResponse {
     let packet: ntp_packet_t
diff --git a/Sources/Reachability.swift b/Sources/TrueTime/Reachability.swift
similarity index 100%
rename from Sources/Reachability.swift
rename to Sources/TrueTime/Reachability.swift
diff --git a/Sources/ReferenceTime.swift b/Sources/TrueTime/ReferenceTime.swift
similarity index 98%
rename from Sources/ReferenceTime.swift
rename to Sources/TrueTime/ReferenceTime.swift
index f187b25..bcd95bd 100644
--- a/Sources/ReferenceTime.swift
+++ b/Sources/TrueTime/ReferenceTime.swift
@@ -6,6 +6,9 @@
 //  Copyright © 2016 Instacart. All rights reserved.
 //
 
+import Foundation
+import CTrueTime
+
 typealias FrozenTimeResult = Result<FrozenTime, NSError>
 typealias FrozenTimeCallback = (FrozenTimeResult) -> Void
 
diff --git a/Sources/SocketAddress.swift b/Sources/TrueTime/SocketAddress.swift
similarity index 100%
rename from Sources/SocketAddress.swift
rename to Sources/TrueTime/SocketAddress.swift
diff --git a/Sources/TimedOperation.swift b/Sources/TrueTime/TimedOperation.swift
similarity index 100%
rename from Sources/TimedOperation.swift
rename to Sources/TrueTime/TimedOperation.swift
diff --git a/Sources/TrueTime.swift b/Sources/TrueTime/TrueTime.swift
similarity index 96%
rename from Sources/TrueTime.swift
rename to Sources/TrueTime/TrueTime.swift
index a588a4e..04793f6 100644
--- a/Sources/TrueTime.swift
+++ b/Sources/TrueTime/TrueTime.swift
@@ -8,6 +8,12 @@
 
 import Foundation
 
+let TrueTimeErrorDomain = "com.instacart.TrueTimeErrorDomain"
+
+public extension Notification.Name {
+    static let TrueTimeUpdated = Notification.Name.init("TrueTimeUpdatedNotification")
+}
+
 @objc public enum TrueTimeError: Int {
     case cannotFindHost
     case dnsLookupFailed
diff --git a/Tests/ArbitraryExtensions.swift b/Tests/TrueTimeTests/ArbitraryExtensions.swift
similarity index 96%
rename from Tests/ArbitraryExtensions.swift
rename to Tests/TrueTimeTests/ArbitraryExtensions.swift
index e7737cb..da920d1 100644
--- a/Tests/ArbitraryExtensions.swift
+++ b/Tests/TrueTimeTests/ArbitraryExtensions.swift
@@ -7,6 +7,7 @@
 //
 
 @testable import TrueTime
+import CTrueTime
 import SwiftCheck
 
 extension timeval: Arbitrary {
diff --git a/Tests/Info.plist b/Tests/TrueTimeTests/Info.plist
similarity index 100%
rename from Tests/Info.plist
rename to Tests/TrueTimeTests/Info.plist
diff --git a/Tests/NTPExtensionsSpec.swift b/Tests/TrueTimeTests/NTPExtensionsSpec.swift
similarity index 97%
rename from Tests/NTPExtensionsSpec.swift
rename to Tests/TrueTimeTests/NTPExtensionsSpec.swift
index 6107abb..e49d0a0 100644
--- a/Tests/NTPExtensionsSpec.swift
+++ b/Tests/TrueTimeTests/NTPExtensionsSpec.swift
@@ -7,6 +7,7 @@
 //
 
 @testable import TrueTime
+import CTrueTime
 import Nimble
 import Quick
 import SwiftCheck
diff --git a/Tests/NTPIntegrationSpec.swift b/Tests/TrueTimeTests/NTPIntegrationSpec.swift
similarity index 99%
rename from Tests/NTPIntegrationSpec.swift
rename to Tests/TrueTimeTests/NTPIntegrationSpec.swift
index 346f8e7..81c762a 100644
--- a/Tests/NTPIntegrationSpec.swift
+++ b/Tests/TrueTimeTests/NTPIntegrationSpec.swift
@@ -7,6 +7,7 @@
 //
 
 @testable import TrueTime
+import Foundation
 import Nimble
 import Quick