diff --git a/AdjustIO.podspec b/AdjustIO.podspec
index e0fac1844..957351d91 100644
--- a/AdjustIO.podspec
+++ b/AdjustIO.podspec
@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name         = "AdjustIO"
-  s.version      = "2.1.3"
+  s.version      = "2.1.4"
   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 => "v2.1.3" }
+  s.source       = { :git => "https://github.com/adeven/adjust_ios_sdk.git", :tag => "v2.1.4" }
   s.platform     = :ios, '4.3'
   s.framework    = 'AdSupport', 'SystemConfiguration'
   s.source_files = 'AdjustIo/*.{h,m}', 'AdjustIo/AIAdditions/*.{h,m}'
diff --git a/AdjustIo/AIActivityHandler.h b/AdjustIo/AIActivityHandler.h
index 0de2f7a40..ea53ea96b 100644
--- a/AdjustIo/AIActivityHandler.h
+++ b/AdjustIo/AIActivityHandler.h
@@ -12,6 +12,7 @@
 
 @property (nonatomic, copy) NSString *environment;
 @property (nonatomic, assign) BOOL bufferEvents;
+@property (nonatomic, assign) BOOL trackMacMd5;
 
 + (AIActivityHandler *)handlerWithAppToken:(NSString *)appToken;
 - (id)initWithAppToken:(NSString *)appToken;
diff --git a/AdjustIo/AIActivityHandler.m b/AdjustIo/AIActivityHandler.m
index 2441cede6..0701a2726 100644
--- a/AdjustIo/AIActivityHandler.m
+++ b/AdjustIo/AIActivityHandler.m
@@ -59,9 +59,12 @@ - (id)initWithAppToken:(NSString *)yourAppToken {
 
     [self addNotificationObserver];
     self.internalQueue = dispatch_queue_create(kInternalQueueName, DISPATCH_QUEUE_SERIAL);
-    self.environment   = @"unknown"; // default value
     self.clientSdk     = AIUtil.clientSdk;
 
+    // default values
+    self.environment = @"unknown";
+    self.trackMacMd5 = YES;
+
     dispatch_async(self.internalQueue, ^{
         [self initInternal:yourAppToken];
     });
@@ -330,12 +333,15 @@ - (void)injectGeneralAttributes:(AIPackageBuilder *)builder {
     builder.userAgent        = self.userAgent;
     builder.clientSdk        = self.clientSdk;
     builder.appToken         = self.appToken;
-    builder.macShortMd5      = self.macShortMd5;
     builder.macSha1          = self.macSha1;
     builder.trackingEnabled  = self.trackingEnabled;
     builder.idForAdvertisers = self.idForAdvertisers;
     builder.fbAttributionId  = self.fbAttributionId;
     builder.environment      = self.environment;
+
+    if (self.trackMacMd5) {
+        builder.macShortMd5 = self.macShortMd5;
+    }
 }
 
 # pragma mark - timer
diff --git a/AdjustIo/AIUtil.m b/AdjustIo/AIUtil.m
index b06e391a8..34e8451e9 100644
--- a/AdjustIo/AIUtil.m
+++ b/AdjustIo/AIUtil.m
@@ -13,7 +13,7 @@
 #include <sys/xattr.h>
 
 static NSString * const kBaseUrl   = @"https://app.adjust.io";
-static NSString * const kClientSdk = @"ios2.1.3";
+static NSString * const kClientSdk = @"ios2.1.4";
 
 
 #pragma mark -
diff --git a/AdjustIo/AdjustIo.h b/AdjustIo/AdjustIo.h
index b8f8dbd57..e241f0dd4 100644
--- a/AdjustIo/AdjustIo.h
+++ b/AdjustIo/AdjustIo.h
@@ -67,6 +67,23 @@ static NSString * const AIEnvironmentProduction = @"production";
 + (void)trackRevenue:(double)amountInCents forEvent:(NSString *)eventToken;
 + (void)trackRevenue:(double)amountInCents forEvent:(NSString *)eventToken withParameters:(NSDictionary *)parameters;
 
+/**
+ * Change the verbosity of AdjustIo's logs.
+ *
+ * You can increase or reduce the amount of logs from AdjustIo by passing
+ * one of the following parameters. Use Log.ASSERT to disable all logging.
+ *
+ * @param logLevel The desired minimum log level (default: info)
+ *     Must be one of the following:
+ *      - AILogLevelVerbose (enable all logging)
+ *      - AILogLevelDebug   (enable more logging)
+ *      - AILogLevelInfo    (the default)
+ *      - AILogLevelWarn    (disable info logging)
+ *      - AILogLevelError   (disable warnings as well)
+ *      - AILogLevelAssert  (disable errors as well)
+ */
++ (void)setLogLevel:(AILogLevel)logLevel;
+
 /**
  * Set the tracking environment to sandbox or production.
  *
@@ -88,21 +105,11 @@ static NSString * const AIEnvironmentProduction = @"production";
 + (void)setEventBufferingEnabled:(BOOL)enabled;
 
 /**
- * Change the verbosity of AdjustIo's logs.
- *
- * You can increase or reduce the amount of logs from AdjustIo by passing
- * one of the following parameters. Use Log.ASSERT to disable all logging.
+ * Enable or disable tracking of the MD5 hash of the MAC address
  *
- * @param logLevel The desired minimum log level (default: info)
- *     Must be one of the following:
- *      - AILogLevelVerbose (enable all logging)
- *      - AILogLevelDebug   (enable more logging)
- *      - AILogLevelInfo    (the default)
- *      - AILogLevelWarn    (disable info logging)
- *      - AILogLevelError   (disable warnings as well)
- *      - AILogLevelAssert  (disable errors as well)
+ * Disable macMd5 tracking if your privacy constraints require it.
  */
-+ (void)setLogLevel:(AILogLevel)logLevel;
++ (void)setMacMd5TrackingEnabled:(BOOL)enabled;
 
 // Special method used by SDK wrappers such as Adobe Air SDK.
 + (void)setSdkPrefix:(NSString *)sdkPrefix __attribute__((deprecated));
diff --git a/AdjustIo/AdjustIo.m b/AdjustIo/AdjustIo.m
index 6351e6cf2..9799e0d73 100644
--- a/AdjustIo/AdjustIo.m
+++ b/AdjustIo/AdjustIo.m
@@ -51,6 +51,10 @@ + (void)trackRevenue:(double)amountInCents
     [activityHandler trackRevenue:amountInCents forEvent:eventToken withParameters:parameters];
 }
 
++ (void)setLogLevel:(AILogLevel)logLevel {
+    [AILogger setLogLevel:logLevel];
+}
+
 + (void)setEnvironment:(NSString *)environment {
     if (activityHandler == nil) {
         [AILogger error:@"Please call `setEnvironment` after `appDidLaunch`!"];
@@ -77,8 +81,14 @@ + (void)setEventBufferingEnabled:(BOOL)enabled {
     if (enabled) [AILogger info:@"Event buffering is enabled"];
 }
 
-+ (void)setLogLevel:(AILogLevel)logLevel {
-    [AILogger setLogLevel:logLevel];
++ (void)setMacMd5TrackingEnabled:(BOOL)enabled {
+    if (activityHandler == nil) {
+        [AILogger error:@"Please call `setMacMd5TrackingEnabled` after `appDidLaunch`!"];
+        return;
+    }
+
+    activityHandler.trackMacMd5 = enabled;
+    [AILogger info:@"Tracking of macMd5 is %@", enabled ? @"enabled" : @"disabled"];
 }
 
 @end
diff --git a/README.md b/README.md
index 39be052fb..7f2ded24c 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 => 'v2.1.3'
+pod 'AdjustIO', :git => 'git://github.com/adeven/adjust_ios_sdk.git', :tag => 'v2.1.4'
 ```
 
 ### 1. Get the SDK
diff --git a/VERSION b/VERSION
index ac2cdeba0..7d2ed7c70 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.3
+2.1.4
diff --git a/doc/migration.md b/doc/migration.md
index 85805f0f3..8d908635f 100644
--- a/doc/migration.md
+++ b/doc/migration.md
@@ -1,7 +1,7 @@
-## Migrate your AdjustIo SDK for iOS from v1.x to v2.1.3
+## Migrate your AdjustIo SDK for iOS from v1.x to v2.1.4
 
 1. Delete the old `AdjustIo` source folder from your Xcode project. Download
-   version v2.1.3 and drag the new folder into your Xcode project.
+   version v2.1.4 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 2.1.3 uses [ARC][arc]. If you haven't done already,
+2. The AdjustIo SDK for iOS 2.1.4 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.