diff --git a/README.md b/README.md
index f1a83ad..fed2133 100644
--- a/README.md
+++ b/README.md
@@ -7,8 +7,8 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 [![Cocoapods Compatible](https://img.shields.io/cocoapods/v/SnapKit.svg)](https://cocoapods.org/pods/SnapKit)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
 
-#### ⚠️ **To use with Swift 2.x please ensure you are using == 0.22.0** ⚠️ 
 #### ⚠️ **To use with Swift 3.x please ensure you are using >= 3.0.0** ⚠️ 
+#### ⚠️ **To use with Swift 4.x please ensure you are using >= 4.0.0** ⚠️ 
 
 ## Contents
 
@@ -23,13 +23,9 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 ## Requirements
 
 - iOS 8.0+ / Mac OS X 10.11+ / tvOS 9.0+
-- Xcode 8.0+
+- Xcode 9.0+
 - Swift 3.0+
 
-## Migration Guides
-
-- [SnapKit 3.0 Migration Guide](https://github.com/SnapKit/SnapKit/blob/master/Documentation/SnapKit%203.0%20Migration%20Guide.md)
-
 ## Communication
 
 - If you **need help**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/snapkit). (Tag 'snapkit')
@@ -49,7 +45,7 @@ SnapKit is a DSL to make Auto Layout easy on both iOS and OS X.
 $ gem install cocoapods
 ```
 
-> CocoaPods 1.1.0+ is required to build SnapKit 3.0.0+.
+> CocoaPods 1.1.0+ is required to build SnapKit 4.0.0+.
 
 To integrate SnapKit into your Xcode project using CocoaPods, specify it in your `Podfile`:
 
@@ -59,7 +55,7 @@ platform :ios, '10.0'
 use_frameworks!
 
 target '<Your Target Name>' do
-    pod 'SnapKit', '~> 3.2.0'
+    pod 'SnapKit', '~> 4.0.0'
 end
 ```
 
@@ -83,7 +79,7 @@ $ brew install carthage
 To integrate SnapKit into your Xcode project using Carthage, specify it in your `Cartfile`:
 
 ```ogdl
-github "SnapKit/SnapKit" ~> 3.2.0
+github "SnapKit/SnapKit" ~> 4.0.0
 ```
 
 Run `carthage update` to build the framework and drag the built `SnapKit.framework` into your Xcode project.
diff --git a/SnapKit.podspec b/SnapKit.podspec
index f392991..7b50368 100644
--- a/SnapKit.podspec
+++ b/SnapKit.podspec
@@ -1,12 +1,12 @@
 Pod::Spec.new do |s|
   s.name = 'SnapKit'
-  s.version = '3.2.0'
+  s.version = '4.0.0'
   s.license = 'MIT'
   s.summary = 'Harness the power of auto layout with a simplified, chainable, and compile time safe syntax.'
   s.homepage = 'https://github.com/SnapKit/SnapKit'
   s.authors = { 'Robert Payne' => 'robertpayne@me.com' }
   s.social_media_url = 'http://twitter.com/robertjpayne'
-  s.source = { :git => 'https://github.com/SnapKit/SnapKit.git', :tag => '3.2.0' }
+  s.source = { :git => 'https://github.com/SnapKit/SnapKit.git', :tag => '4.0.0' }
 
   s.ios.deployment_target = '8.0'
   s.osx.deployment_target = '10.11'
diff --git a/SnapKit.xcodeproj/project.pbxproj b/SnapKit.xcodeproj/project.pbxproj
index 9bdb554..58f9b93 100644
--- a/SnapKit.xcodeproj/project.pbxproj
+++ b/SnapKit.xcodeproj/project.pbxproj
@@ -179,8 +179,8 @@
 		EE235F5C1C5785A400C08960 /* Models */ = {
 			isa = PBXGroup;
 			children = (
-				EE235F621C5785C600C08960 /* Constraint.swift */,
 				2DBA080D1F1FAD66001CFED4 /* Typealiases.swift */,
+				EE235F621C5785C600C08960 /* Constraint.swift */,
 				EE235F631C5785C600C08960 /* ConstraintDescription.swift */,
 				EE235F641C5785C600C08960 /* ConstraintInsets.swift */,
 				EE235F651C5785C600C08960 /* ConstraintConfig.swift */,