diff --git a/Cartfile.resolved b/Cartfile.resolved
index 1548d66..d7e97d9 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,2 +1,2 @@
-binary "https://raw.githubusercontent.com/AppsFlyerSDK/AppsFlyerFramework/master/Carthage/appsflyer-ios.json" "6.3.4"
+binary "https://raw.githubusercontent.com/AppsFlyerSDK/AppsFlyerFramework/master/Carthage/appsflyer-ios.json" "6.4.0"
 github "segmentio/analytics-ios" "4.1.5"
diff --git a/README.md b/README.md
index bedcaff..d11dfdd 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 # AppsFlyer integration for Segment.
 
-## This is a Segment wrapper for AppsFlyer SDK that is built with iOS SDK v6.3.5. 
+## This is a Segment wrapper for AppsFlyer SDK that is built with iOS SDK v6.4.0. 
 
 [![Version](https://img.shields.io/cocoapods/v/segment-appsflyer-ios.svg?style=flat)](http://cocoapods.org/pods/segment-appsflyer-ios)
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
@@ -47,12 +47,12 @@ To install the segment-appsflyer-ios integration:
 
 **Production** version: 
 ```ruby
-pod 'segment-appsflyer-ios', '6.3.5'
+pod 'segment-appsflyer-ios', '6.4.0'
 ```
 
 **Strict mode SDK** version: 
 ```ruby
-pod 'segment-appsflyer-ios/Strict', '6.3.5'
+pod 'segment-appsflyer-ios/Strict', '6.4.0'
 ```
 Use the strict mode SDK to completely remove IDFA collection functionality and AdSupport framework dependencies (for example, when developing apps for kids).
 
@@ -64,7 +64,7 @@ Use the strict mode SDK to completely remove IDFA collection functionality and A
 
 **Production** version: 
 ```ogdl
-github "AppsFlyerSDK/segment-appsflyer-ios" "6.3.5"
+github "AppsFlyerSDK/segment-appsflyer-ios" "6.4.0"
 ```
 
   
diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index b9d857e..f330a13 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -1,5 +1,7 @@
 # Release Notes
 
+### 6.4.0
+* Updated iOS SDK to v6.4.0
 
 ### 6.3.5
 * Updated iOS SDK to v6.3.5
diff --git a/segment-appsflyer-ios.podspec b/segment-appsflyer-ios.podspec
index 99b6e64..6c62cab 100644
--- a/segment-appsflyer-ios.podspec
+++ b/segment-appsflyer-ios.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = "segment-appsflyer-ios"
-  s.version          = "6.3.5"
+  s.version          = "6.4.0"
   s.summary          = "AppsFlyer Integration for Segment's analytics-ios library."
 
   s.description      = <<-DESC