diff --git a/.travis.yml b/.travis.yml
index 4395f27..5fc6002 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,55 +15,29 @@ matrix:
       dist: xenial
       sudo: required
       services: docker
-      env:  DOCKER_IMAGE=swift:4.0.3 SWIFT_SNAPSHOT=4.0.3
+      env: DOCKER_IMAGE=docker.kitura.net/kitura/swift-ci-ubuntu16.04:5.2.5 SWIFT_TEST_ARGS=""
     - os: linux
-      dist: xenial
-      sudo: required
-      services: docker
-      env: DOCKER_IMAGE=swift:4.1.3 SWIFT_SNAPSHOT=4.1.3
-    - os: linux
-      dist: xenial
+      dist: bionic
       sudo: required
       services: docker
-      env: DOCKER_IMAGE=swift:4.2.4 SWIFT_SNAPSHOT=4.2.4
+      env: DOCKER_IMAGE=docker.kitura.net/kitura/swift-ci-ubuntu18.04:5.4 SWIFT_TEST_ARGS=""
     - os: linux
       dist: xenial
       sudo: required
       services: docker
-      env: DOCKER_IMAGE=swift:5.0.3-xenial SWIFT_SNAPSHOT=5.0.3
-    - os: linux
-      dist: xenial
-      sudo: required
-      services: docker
-      env: DOCKER_IMAGE=swift:5.1
-    - os: linux
-      dist: xenial
-      sudo: required
-      services: docker
-      env: DOCKER_IMAGE=swift:5.1 SWIFT_SNAPSHOT=$SWIFT_DEVELOPMENT_SNAPSHOT
-    - os: osx
-      osx_image: xcode9.2
-      sudo: required
-      env: SWIFT_SNAPSHOT=4.0.3
-    - os: osx
-      osx_image: xcode9.4
-      sudo: required
-      env: SWIFT_SNAPSHOT=4.1.2
-    - os: osx
-      osx_image: xcode10.1
-      sudo: required
-      env: SWIFT_SNAPSHOT=4.2.1
+      env: DOCKER_IMAGE=docker.kitura.net/kitura/swift-ci-ubuntu18.04:latest USE_SWIFT_DEVELOPMENT_SNAPSHOT=1 SWIFT_TEST_ARGS=""
     - os: osx
-      osx_image: xcode10.2
+      osx_image: xcode12.2
       sudo: required
-      env: SWIFT_SNAPSHOT=5.0.1 JAZZY_ELIGIBLE=true
+      env: JAZZY_ELIGIBLE=true SWIFT_TEST_ARGS=""
     - os: osx
-      osx_image: xcode11
+      osx_image: xcode12.5
       sudo: required
+      env: SWIFT_TEST_ARGS=""
     - os: osx
-      osx_image: xcode11
+      osx_image: xcode12.5
       sudo: required
-      env: SWIFT_SNAPSHOT=$SWIFT_DEVELOPMENT_SNAPSHOT
+      env: USE_SWIFT_DEVELOPMENT_SNAPSHOT=1 SWIFT_TEST_ARGS=""
 
 before_install:
   - git clone https://github.com/Kitura/Package-Builder.git
diff --git a/Package.swift b/Package.swift
index ec4c4c8..01d3fc2 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:5.0
+// swift-tools-version:5.2
 
 /**
  * Copyright IBM Corporation and the Kitura project authors 2018-2020
@@ -18,6 +18,9 @@
 
 import PackageDescription
 
+
+let targetDependencies: [Target.Dependency]
+
 let package = Package(
     name: "SwiftJWT",
     products: [
@@ -28,15 +31,22 @@ let package = Package(
         )
     ],
     dependencies: [
-        .package(url: "https://github.com/Kitura/BlueRSA.git", from: "1.0.200"),
-        .package(url: "https://github.com/Kitura/BlueCryptor.git", from: "2.0.1"),
-        .package(url: "https://github.com/Kitura/BlueECC.git", from: "1.1.0"),
-        .package(url: "https://github.com/Kitura/LoggerAPI.git", from: "1.7.0"),
-        .package(url: "https://github.com/Kitura/KituraContracts.git", from: "1.2.200")
+        .package(name: "CryptorRSA", url: "https://github.com/Kitura/BlueRSA.git", from: "1.0.200"),
+        .package(name: "Cryptor", url: "https://github.com/Kitura/BlueCryptor.git", from: "2.0.1"),
+        .package(name: "CryptorECC", url: "https://github.com/Kitura/BlueECC.git", from: "1.2.200"),
+        .package(url: "https://github.com/Kitura/LoggerAPI.git", from: "2.0.0"),
+        .package(url: "https://github.com/Kitura/KituraContracts.git", from: "2.0.1")
     ],
     targets: [
-        .target(name: "SwiftJWT", dependencies: ["CryptorRSA", "LoggerAPI", "KituraContracts", "Cryptor", "CryptorECC"]),
+        .target(name: "SwiftJWT", dependencies: [
+            "LoggerAPI",
+            "KituraContracts",
+            "CryptorRSA",
+            "Cryptor",
+            "CryptorECC",
+        ]),
         .testTarget(name: "SwiftJWTTests", dependencies: ["SwiftJWT"])
 	]
 )
 
+
diff --git a/Package@swift-4.swift b/Package@swift-4.swift
deleted file mode 100644
index 15caa6a..0000000
--- a/Package@swift-4.swift
+++ /dev/null
@@ -1,41 +0,0 @@
-// swift-tools-version:4.0
-
-/**
- * Copyright IBM Corporation and the Kitura project authors 2018-2020
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- **/
-
-import PackageDescription
-
-let package = Package(
-    name: "SwiftJWT",
-    products: [
-        // Products define the executables and libraries produced by a package, and make them visible to other packages.
-        .library(
-            name: "SwiftJWT",
-            targets: ["SwiftJWT"]
-        )
-    ],
-    dependencies: [
-        .package(url: "https://github.com/Kitura/BlueRSA.git", from: "1.0.200"),
-        .package(url: "https://github.com/Kitura/BlueCryptor.git", from: "1.0.0"),
-        .package(url: "https://github.com/Kitura/BlueECC.git", from: "1.1.0"),
-        .package(url: "https://github.com/Kitura/LoggerAPI.git", from: "1.7.0"),
-        .package(url: "https://github.com/Kitura/KituraContracts.git", from: "1.2.200")
-    ],
-    targets: [
-        .target(name: "SwiftJWT", dependencies: ["CryptorRSA", "LoggerAPI", "KituraContracts", "Cryptor", "CryptorECC"]),
-        .testTarget(name: "SwiftJWTTests", dependencies: ["SwiftJWT"])
-	]
-)
diff --git a/README.md b/README.md
index 53cdde9..904e795 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ For more information on JSON Web Tokens, their use cases and how they work, we r
 **Reminder:** JWTs sent as JWS do **not** encrypt data, so never send anything sensitive or confidential in a JWT. This library does not currently support JWE.
 
 ## Swift version
-The latest version of Swift-JWT requires **Swift 4.0** or later. You can download this version of the Swift binaries by following this [link](https://swift.org/download/). Compatibility with other Swift versions is not guaranteed.
+The latest version of Swift-JWT requires **Swift 5.2** or later. You can download this version of the Swift binaries by following this [link](https://swift.org/download/). Compatibility with other Swift versions is not guaranteed.
 
 ## Usage
 
diff --git a/SwiftJWT.podspec b/SwiftJWT.podspec
index 6a874f1..904ec32 100644
--- a/SwiftJWT.podspec
+++ b/SwiftJWT.podspec
@@ -1,12 +1,12 @@
 Pod::Spec.new do |s|
   s.name         = "SwiftJWT"
-  s.version      = "3.6.201"
+  s.version      = "4.0.0"
   s.summary      = "An implementation of JSON Web Token using Swift."
   s.homepage     = "https://github.com/Kitura/Swift-JWT"
   s.license      = { :type => "Apache License, Version 2.0" }
   s.authors      = 'IBM and the Kitura project authors'
   s.module_name  = 'SwiftJWT'
-  s.swift_version = '5.1'
+  s.swift_version = '5.2'
   s.osx.deployment_target = "10.13"
   s.ios.deployment_target = "11.0"
   s.tvos.deployment_target = "11.0"
@@ -14,8 +14,8 @@ Pod::Spec.new do |s|
   s.source       = { :git => "https://github.com/Kitura/Swift-JWT.git", :tag => s.version }
   s.source_files  = "Sources/**/*.swift"
   s.dependency 'BlueRSA', '~> 1.0.200'
-  s.dependency 'BlueECC', '~> 1.1.0'
-  s.dependency 'LoggerAPI', '~> 1.7.0'
-  s.dependency 'KituraContracts', '~> 1.2.200'
   s.dependency 'BlueCryptor', '~> 2.0.1'
+  s.dependency 'BlueECC', '~> 1.2.200'
+  s.dependency 'LoggerAPI', '~> 2.0.0'
+  s.dependency 'KituraContracts', '~> 2.0.1'
 end