diff --git a/PMHTTP.podspec b/PMHTTP.podspec
index 078fa59..931b3c0 100644
--- a/PMHTTP.podspec
+++ b/PMHTTP.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = "PMHTTP"
-  s.version      = "3.0.5"
+  s.version      = "4.0.0"
   s.summary      = "Swift/Obj-C HTTP framework with a focus on REST and JSON"
 
   s.description  = <<-DESC
diff --git a/README.md b/README.md
index 06156af..b496d0a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # PMHTTP
 
-[![Version](https://img.shields.io/badge/version-v3.0.5-blue.svg)](https://github.com/postmates/PMHTTP/releases/latest)
+[![Version](https://img.shields.io/badge/version-v4.0.0-blue.svg)](https://github.com/postmates/PMHTTP/releases/latest)
 ![Platforms](https://img.shields.io/badge/platforms-ios%20%7C%20osx%20%7C%20watchos%20%7C%20tvos-lightgrey.svg)
 ![Languages](https://img.shields.io/badge/languages-swift%20%7C%20objc-orange.svg)
 ![License](https://img.shields.io/badge/license-MIT%2FApache-blue.svg)
@@ -373,26 +373,26 @@ After installation with any mechanism, you can use this by adding `import PMHTTP
 To install using [Carthage][], add the following to your Cartfile:
 
 ```
-github "postmates/PMHTTP" ~> 3.0
+github "postmates/PMHTTP" ~> 4.0
 ```
 
-This release supports Swift 3.0. For Swift 2.3 you can use
+This release supports Swift 4.0. For Swift 3.x you can use
 
 ```
-github "postmates/PMHTTP" ~> 0.9.3
+github "postmates/PMHTTP" ~> 3.0
 ```
 
 ### CocoaPods
 To install using [CocoaPods](https://cocoapods.org), add the following to your Podfile:
 
 ```
-pod "PMHTTP", "~> 3.0"
+pod "PMHTTP", "~> 4.0"
 ```
 
-This release supports Swift 3.0. For Swift 2.3 you can use:
+This release supports Swift 4.0. For Swift 3.x you can use:
 
 ```
-pod "PMHTTP", "~> 0.9.3"
+pod "PMHTTP", "~> 3.0"
 ```
 
 ## License
@@ -410,7 +410,7 @@ work by you shall be dual licensed as above, without any additional terms or con
 
 ## Version History
 
-#### Development
+#### v4.0.0 (2018-02-23)
 
 * Convert to Swift 4.
 * Add a method `HTTPManagerParseRequest.map(_:)`.
diff --git a/Sources/Info.plist b/Sources/Info.plist
index 6beef23..1bcfa6d 100644
--- a/Sources/Info.plist
+++ b/Sources/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.0.5</string>
+	<string>4.0.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
diff --git a/Tests/Info.plist b/Tests/Info.plist
index e3366cf..18f6dd6 100644
--- a/Tests/Info.plist
+++ b/Tests/Info.plist
@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>BNDL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.0.5</string>
+	<string>4.0.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>