diff --git a/PayPalMobile/PayPalMobile.h b/PayPalMobile/PayPalMobile.h
index dc1dcbe..f060d74 100644
--- a/PayPalMobile/PayPalMobile.h
+++ b/PayPalMobile/PayPalMobile.h
@@ -1,7 +1,7 @@
 //
 //  PayPalMobile.h
 //
-//  Version 1.3.6
+//  Version 1.4.0
 //
 //  Copyright (c) 2013, PayPal
 //  All rights reserved.
diff --git a/PayPalMobile/PayPalPayment.h b/PayPalMobile/PayPalPayment.h
index 733c724..5151dc7 100644
--- a/PayPalMobile/PayPalPayment.h
+++ b/PayPalMobile/PayPalPayment.h
@@ -1,7 +1,7 @@
 //
 //  PayPalPayment.h
 //
-//  Version 1.3.6
+//  Version 1.4.0
 //
 //  Copyright (c) 2013, PayPal
 //  All rights reserved.
diff --git a/PayPalMobile/PayPalPaymentViewController.h b/PayPalMobile/PayPalPaymentViewController.h
index 21c8d20..e9ff1e2 100644
--- a/PayPalMobile/PayPalPaymentViewController.h
+++ b/PayPalMobile/PayPalPaymentViewController.h
@@ -1,7 +1,7 @@
 //
 //  PayPalPaymentViewController.h
 //
-//  Version 1.3.6
+//  Version 1.4.0
 //
 //  Copyright (c) 2013, PayPal
 //  All rights reserved.
diff --git a/PayPalMobile/libPayPalMobile.a b/PayPalMobile/libPayPalMobile.a
index 72e3e0a..67b7e6d 100644
Binary files a/PayPalMobile/libPayPalMobile.a and b/PayPalMobile/libPayPalMobile.a differ
diff --git a/README.md b/README.md
index 176b8da..8ee37c5 100644
--- a/README.md
+++ b/README.md
@@ -43,7 +43,7 @@ Integration
 
 * Xcode 5+
 * iOS 6+ target deployment
-* armv7 and armv7s devices and the simulator (not armv6)
+* armv7, armv7s, and arm64 devices and the simulator (not armv6)
 * iPhone and iPad of all sizes and resolutions
 
 
@@ -52,7 +52,7 @@ Integration
 1. Clone or download the SDK, which consists of header files, license acknowledgements, release notes, and a static library. It also includes a sample app.
 2. Add the `PayPalMobile` directory (containing several .h files and libPayPalMobile.a) to your Xcode project. We recommend checking "Copy items..." and selecting "Create groups...".
 3. In your project's **Build Settings**, add `-lc++ -ObjC` to Other Linker Flags.
-4. In your project's **Build Phases**, link your project with these libraries. Weak linking for iOS versions back to 5.0 is supported.
+4. In your project's **Build Phases**, link your project with these libraries. Weak linking for iOS versions back to 6.0 is supported.
   * `AVFoundation.framework`
   * `AudioToolbox.framework`
   * `CoreMedia.framework`
diff --git a/SampleApp/PayPal-iOS-SDK-Sample-App/PayPal-iOS-SDK-Sample-App-Info.plist b/SampleApp/PayPal-iOS-SDK-Sample-App/PayPal-iOS-SDK-Sample-App-Info.plist
index de35faa..9ddd185 100644
--- a/SampleApp/PayPal-iOS-SDK-Sample-App/PayPal-iOS-SDK-Sample-App-Info.plist
+++ b/SampleApp/PayPal-iOS-SDK-Sample-App/PayPal-iOS-SDK-Sample-App-Info.plist
@@ -30,11 +30,11 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>1.3.6</string>
+	<string>1.4.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>1.3.6</string>
+	<string>1.4.0</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>UIMainStoryboardFile</key>
diff --git a/release_notes.md b/release_notes.md
index 445b53b..e52d819 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -1,6 +1,12 @@
 PayPal iOS SDK release notes
 ============================
 
+1.4.0
+-----
+* Make 64-bit compatible
+* Require iOS 6.0 or greater
+* Update card.io library to 3.4.0
+
 1.3.6
 -----
 * Fix a problem with repeat purchase resulting in 52003 error on Sandbox