diff --git a/AwsSign.podspec b/AwsSign.podspec
index af886ad..42f2c16 100644
--- a/AwsSign.podspec
+++ b/AwsSign.podspec
@@ -9,13 +9,13 @@ Pod::Spec.new do |s|
   s.source       = { :git => "https://github.com/nikola-mladenovic/AwsSwiftSign.git", :tag => s.version.to_s }
   s.source_files = 'Source/*.swift'
   s.swift_version = "4.2"
-  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '4.2' }
+  s.pod_target_xcconfig = { 'SWIFT_VERSION' => '5.1' }
 
   s.ios.deployment_target = '10.0'
   s.osx.deployment_target = '10.10'
   s.tvos.deployment_target = '9.0'
   s.watchos.deployment_target = '2.2'
 
-  s.dependency 'CryptoSwift', '~> 0.12'
+  s.dependency 'CryptoSwift', '~> 1.3'
 
 end
diff --git a/Package.swift b/Package.swift
index 8ef6e09..e4de413 100755
--- a/Package.swift
+++ b/Package.swift
@@ -1,11 +1,11 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.1
 
 import PackageDescription
 
 let package = Package(
     name: "AwsSign",
     products: [.library(name: "AwsSign", targets: ["AwsSign"])],
-    dependencies: [.package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "0.12.0")],
+    dependencies: [.package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", from: "1.3.0")],
     targets: [.target(name: "AwsSign", dependencies: ["CryptoSwift"], path: "Source")],
-    swiftLanguageVersions: [.v4_2]
+    swiftLanguageVersions: [.v5]
 )
diff --git a/README.md b/README.md
index f0ce0a2..055a878 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ AwsSign is a Swift library that enables you to sign `URLRequest`s using Signatur
 
 <p>
     <a href="https://developer.apple.com/swift/" target="_blank">
-        <img src="https://img.shields.io/badge/Swift-4.2-orange.svg?style=flat" alt="Swift 4.2">
+        <img src="https://img.shields.io/badge/Swift-5.1-orange.svg?style=flat" alt="Swift 5.1">
     </a>
     <a href="https://developer.apple.com/swift/" target="_blank">
         <img src="https://img.shields.io/badge/Platforms-iOS%20%7C%20macOS%20%7C%20watchOS%20%7C%20tvOS%20%7C%20Linux-4E4E4E.svg?colorA=EF5138" alt="Platforms iOS | macOS | watchOS | tvOS | Linux">
@@ -14,7 +14,7 @@ AwsSign is a Swift library that enables you to sign `URLRequest`s using Signatur
     </a>
 </p>
 
-This package builds with Swift Package Manager. Ensure you have installed and activated the latest Swift 4.2 tool chain.
+This package builds with Swift Package Manager. Ensure you have installed and activated the latest Swift 5.1 tool chain.
 
 ## Quick Start
 
diff --git a/Source/AwsSign.swift b/Source/AwsSign.swift
index 1b56698..13c1b85 100755
--- a/Source/AwsSign.swift
+++ b/Source/AwsSign.swift
@@ -1,4 +1,7 @@
 import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
 import CryptoSwift
 
 public extension URLRequest {
@@ -20,7 +23,7 @@ public extension URLRequest {
         return (full: date, short: String(shortDate))
     }
 
-    public mutating func sign(accessKeyId: String, secretAccessKey: String) throws {
+    mutating func sign(accessKeyId: String, secretAccessKey: String) throws {
         guard let url = url, let host = url.host, let method = httpMethod else { throw SignError.generalError(reason: "URLRequest doesn't have a proper URL") }
         let hostComponents = host.components(separatedBy: ".")
         guard hostComponents.count > 3 else { throw SignError.generalError(reason: "Incorrect host format. The host should contain service name and region, e.g sns.us-east-1.amazonaws.com") }