diff --git a/AdjustIO.podspec b/AdjustIO.podspec
index 471a51eb0..e0fac1844 100644
--- a/AdjustIO.podspec
+++ b/AdjustIO.podspec
@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name         = "AdjustIO"
-  s.version      = "2.1.2"
+  s.version      = "2.1.3"
   s.summary      = "This is the iOS SDK of AdjustIo. You can read more about it at http://adjust.io."
   s.homepage     = "http://adjust.io"
   s.license      = { :type => 'MIT', :file => 'MIT-LICENSE' }
   s.author       = { "Christian Wellenbrock" => "welle@adeven.com" }
-  s.source       = { :git => "https://github.com/adeven/adjust_ios_sdk.git", :tag => "v2.1.2" }
+  s.source       = { :git => "https://github.com/adeven/adjust_ios_sdk.git", :tag => "v2.1.3" }
   s.platform     = :ios, '4.3'
   s.framework    = 'AdSupport', 'SystemConfiguration'
   s.source_files = 'AdjustIo/*.{h,m}', 'AdjustIo/AIAdditions/*.{h,m}'
diff --git a/AdjustIo/AIUtil.m b/AdjustIo/AIUtil.m
index a216268fa..b06e391a8 100644
--- a/AdjustIo/AIUtil.m
+++ b/AdjustIo/AIUtil.m
@@ -10,8 +10,10 @@
 #import "AILogger.h"
 #import "UIDevice+AIAdditions.h"
 
+#include <sys/xattr.h>
+
 static NSString * const kBaseUrl   = @"https://app.adjust.io";
-static NSString * const kClientSdk = @"ios2.1.2";
+static NSString * const kClientSdk = @"ios2.1.3";
 
 
 #pragma mark -
@@ -72,15 +74,37 @@ + (NSString *)sanitize:(NSString *)string defaultString:(NSString *)defaultStrin
     return result;
 }
 
+// inspired by https://gist.github.com/kevinbarrett/2002382
 + (void)excludeFromBackup:(NSString *)path {
     NSURL *url = [NSURL fileURLWithPath:path];
-    NSError *error = nil;
-    BOOL success = [url setResourceValue:[NSNumber numberWithBool:YES]
-                                  forKey:NSURLIsExcludedFromBackupKey
-                                   error:&error];
-
-    if (!success) {
-        [AILogger debug:@"Failed to exclude '%@' from backup (%@)", url.lastPathComponent, error.localizedDescription];
+    const char* filePath = [[url path] fileSystemRepresentation];
+    const char* attrName = "com.apple.MobileBackup";
+
+    if (&NSURLIsExcludedFromBackupKey == nil) { // iOS 5.0.1 and lower
+        u_int8_t attrValue = 1;
+        int result = setxattr(filePath, attrName, &attrValue, sizeof(attrValue), 0, 0);
+        if (result != 0) {
+            [AILogger debug:@"Failed to exclude '%@' from backup", url.lastPathComponent];
+        }
+    } else { // iOS 5.0 and higher
+        // First try and remove the extended attribute if it is present
+        int result = getxattr(filePath, attrName, NULL, sizeof(u_int8_t), 0, 0);
+        if (result != -1) {
+            // The attribute exists, we need to remove it
+            int removeResult = removexattr(filePath, attrName, 0);
+            if (removeResult == 0) {
+                [AILogger debug:@"Removed extended attribute on file '%@'", url];
+            }
+        }
+
+        // Set the new key
+        NSError *error = nil;
+        BOOL success = [url setResourceValue:[NSNumber numberWithBool:YES]
+                                      forKey:NSURLIsExcludedFromBackupKey
+                                       error:&error];
+        if (!success) {
+            [AILogger debug:@"Failed to exclude '%@' from backup (%@)", url.lastPathComponent, error.localizedDescription];
+        }
     }
 }
 
diff --git a/README.md b/README.md
index e969bd98e..39be052fb 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ If you're using [CocoaPods][cocoapods], you can add the following line to your
 `Podfile` and continue with [step 3](#step3):
 
 ```ruby
-pod 'AdjustIO', :git => 'git://github.com/adeven/adjust_ios_sdk.git', :tag => 'v2.1.2'
+pod 'AdjustIO', :git => 'git://github.com/adeven/adjust_ios_sdk.git', :tag => 'v2.1.3'
 ```
 
 ### 1. Get the SDK
diff --git a/VERSION b/VERSION
index eca07e4c1..ac2cdeba0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.2
+2.1.3
diff --git a/doc/migration.md b/doc/migration.md
index cca85ed60..85805f0f3 100644
--- a/doc/migration.md
+++ b/doc/migration.md
@@ -1,7 +1,7 @@
-## Migrate your AdjustIo SDK for iOS from v1.x to v2.1.2
+## Migrate your AdjustIo SDK for iOS from v1.x to v2.1.3
 
 1. Delete the old `AdjustIo` source folder from your Xcode project. Download
-   version v2.1.2 and drag the new folder into your Xcode project.
+   version v2.1.3 and drag the new folder into your Xcode project.
 
     ![][drag]
 
@@ -55,7 +55,7 @@
 2. The `appDidLaunch` method now expects your App Token instead of your App ID.
    You can find your App Token in your [dashboard].
 
-2. The AdjustIo SDK for iOS 2.1.2 uses [ARC][arc]. If you haven't done already,
+2. The AdjustIo SDK for iOS 2.1.3 uses [ARC][arc]. If you haven't done already,
    we recommend [transitioning your project to use ARC][transition] as well. If
    you don't want to use ARC, you have to enable ARC for all files of the
    AdjustIo SDK. Please consult the [README] for details.