diff --git a/Adjust.podspec b/Adjust.podspec
index 5d9e4f271..df5eaa01d 100644
--- a/Adjust.podspec
+++ b/Adjust.podspec
@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name           = "Adjust"
-  s.version        = "4.11.2"
+  s.version        = "4.11.3"
   s.summary        = "This is the iOS SDK of adjust. You can read more about it at http://adjust.com."
   s.homepage       = "https://github.com/adjust/ios_sdk"
   s.license        = { :type => 'MIT', :file => 'MIT-LICENSE' }
   s.author         = { "Christian Wellenbrock" => "welle@adjust.com" }
-  s.source         = { :git => "https://github.com/adjust/ios_sdk.git", :tag => "v4.11.2" }
+  s.source         = { :git => "https://github.com/adjust/ios_sdk.git", :tag => "v4.11.3" }
   s.ios.deployment_target = '6.0'
   s.tvos.deployment_target = '9.0'
   s.framework      = 'SystemConfiguration'
diff --git a/Adjust/ADJPackageBuilder.m b/Adjust/ADJPackageBuilder.m
index c61d4ab41..cf3b26e5a 100644
--- a/Adjust/ADJPackageBuilder.m
+++ b/Adjust/ADJPackageBuilder.m
@@ -53,6 +53,7 @@ - (ADJActivityPackage *)buildSessionPackage:(ADJSessionParameters *)sessionParam
                                   isInDelay:(BOOL)isInDelay {
     NSMutableDictionary *parameters = [self defaultParameters];
 
+    [ADJPackageBuilder parameters:parameters setInt:0 forKey:@"tce"];
     [ADJPackageBuilder parameters:parameters setString:[ADJUtil getUpdateTime] forKey:@"app_updated_at"];
     [ADJPackageBuilder parameters:parameters setString:[ADJUtil getInstallTime] forKey:@"installed_at"];
     [ADJPackageBuilder parameters:parameters setDuration:self.activityState.lastInterval forKey:@"last_interval"];
@@ -77,6 +78,7 @@ - (ADJActivityPackage *)buildEventPackage:(ADJEvent *)event
                                 isInDelay:(BOOL)isInDelay {
     NSMutableDictionary *parameters = [self defaultParameters];
 
+    [ADJPackageBuilder parameters:parameters setInt:0 forKey:@"tce"];
     [ADJPackageBuilder parameters:parameters setInt:self.activityState.eventCount forKey:@"event_count"];
     [ADJPackageBuilder parameters:parameters setNumber:event.revenue forKey:@"revenue"];
     [ADJPackageBuilder parameters:parameters setString:event.currency forKey:@"currency"];
@@ -151,6 +153,7 @@ - (ADJActivityPackage *)buildClickPackage:(NSString *)clickSource {
 - (ADJActivityPackage *)buildInfoPackage:(NSString *)infoSource {
     NSMutableDictionary *parameters = [self idsParameters];
 
+    [ADJPackageBuilder parameters:parameters setInt:0 forKey:@"tce"];
     [ADJPackageBuilder parameters:parameters setString:infoSource forKey:@"source"];
 
     [self injectPushToken:self.activityState intoParamters:parameters];
@@ -208,7 +211,6 @@ - (NSMutableDictionary *)defaultParameters {
 }
 
 - (void)injectCommonParameters:(NSMutableDictionary *)parameters {
-    [ADJPackageBuilder parameters:parameters setInt:0 forKey:@"tce"];
     [ADJPackageBuilder parameters:parameters setDate1970:self.createdAt forKey:@"created_at"];
     [ADJPackageBuilder parameters:parameters setBool:YES forKey:@"attribution_deeplink"];
     [ADJPackageBuilder parameters:parameters setBool:YES forKey:@"needs_response_details"];
diff --git a/Adjust/ADJUtil.m b/Adjust/ADJUtil.m
index fc06df785..9fe736388 100644
--- a/Adjust/ADJUtil.m
+++ b/Adjust/ADJUtil.m
@@ -29,11 +29,9 @@
 static NSRegularExpression *shortUniversalLinkRegex = nil;
 static NSURLSessionConfiguration *urlSessionConfiguration = nil;
 
-static ADJConnectionValidator *connectionValidator = nil;
-
 static NSString *userAgent = nil;
 
-static NSString * const kClientSdk                  = @"ios4.11.2";
+static NSString * const kClientSdk                  = @"ios4.11.3";
 static NSString * const kDeeplinkParam              = @"deep_link=";
 static NSString * const kSchemeDelimiter            = @"://";
 static NSString * const kDefaultScheme              = @"AdjustUniversalScheme";
@@ -57,7 +55,6 @@ + (void)initialize {
     [self initializeShortUniversalLinkRegex];
     [self initializeOptionalRedirectRegex];
     [self initializeUrlSessionConfiguration];
-    [self initializeConnectionValidator];
 }
 
 + (void)initializeDateFormat {
@@ -142,10 +139,6 @@ + (void)initializeUrlSessionConfiguration {
     urlSessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
 }
 
-+ (void)initializeConnectionValidator {
-    connectionValidator = [[ADJConnectionValidator alloc] init];
-}
-
 + (void)updateUrlSessionConfiguration:(ADJConfig *)config {
     userAgent = config.userAgent;
 }
@@ -435,14 +428,24 @@ + (void)sendNSURLSessionRequest:(NSMutableURLRequest *)request
              suffixErrorMessage:(NSString *)suffixErrorMessage
                 activityPackage:(ADJActivityPackage *)activityPackage
             responseDataHandler:(void (^)(ADJResponseData *responseData))responseDataHandler {
-    int tce = [[activityPackage.parameters objectForKey:@"tce"] intValue];
-
-    [connectionValidator setExpectedTce:tce];
-    [connectionValidator setDidValidationHappen:NO];
+    NSURLSession *session;
+    ADJConnectionValidator *connectionValidator;
+    
+    if (activityPackage.activityKind == ADJActivityKindEvent ||
+        activityPackage.activityKind == ADJActivityKindSession ||
+        activityPackage.activityKind == ADJActivityKindInfo) {
+        int tce = [[activityPackage.parameters objectForKey:@"tce"] intValue];
+        
+        connectionValidator = [[ADJConnectionValidator alloc] init];
+        [connectionValidator setExpectedTce:tce];
+        [connectionValidator setDidValidationHappen:NO];
 
-    NSURLSession *session = [NSURLSession sessionWithConfiguration:urlSessionConfiguration
-                                                          delegate:connectionValidator
-                                                     delegateQueue:nil];
+        session = [NSURLSession sessionWithConfiguration:urlSessionConfiguration
+                                                delegate:connectionValidator
+                                           delegateQueue:nil];
+    } else {
+        session = [NSURLSession sessionWithConfiguration:urlSessionConfiguration];
+    }
 
     NSURLSessionDataTask *task = [session dataTaskWithRequest:request
                                             completionHandler:
@@ -454,10 +457,12 @@ + (void)sendNSURLSessionRequest:(NSMutableURLRequest *)request
                                                                               suffixErrorMessage:suffixErrorMessage
                                                                                  activityPackage:activityPackage];
 
-                                      if (NO == connectionValidator.didValidationHappen) {
-                                          responseData.validationResult = YES;
-                                      } else {
-                                          responseData.validationResult = connectionValidator.validationResult;
+                                      if (nil != connectionValidator) {
+                                          if (NO == connectionValidator.didValidationHappen) {
+                                              responseData.validationResult = YES;
+                                          } else {
+                                              responseData.validationResult = connectionValidator.validationResult;
+                                          }
                                       }
 
                                       responseDataHandler(responseData);
diff --git a/Adjust/Adjust.h b/Adjust/Adjust.h
index 4634fba6a..974fb69a9 100644
--- a/Adjust/Adjust.h
+++ b/Adjust/Adjust.h
@@ -2,7 +2,7 @@
 //  Adjust.h
 //  Adjust
 //
-//  V4.11.2
+//  V4.11.3
 //  Created by Christian Wellenbrock on 2012-07-23.
 //  Copyright (c) 2012-2014 adjust GmbH. All rights reserved.
 //
diff --git a/AdjustTests/ADJPackageFields.m b/AdjustTests/ADJPackageFields.m
index 3ab4e6f12..7dd1c04f3 100644
--- a/AdjustTests/ADJPackageFields.m
+++ b/AdjustTests/ADJPackageFields.m
@@ -16,7 +16,7 @@ - (id) init {
 
     // default values
     self.appToken = @"qwerty123456";
-    self.clientSdk = @"ios4.11.2";
+    self.clientSdk = @"ios4.11.3";
     self.suffix = @"";
     self.environment = @"sandbox";
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 74a9ae64d..32d1e27fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+### Version 4.11.3 (23rd March 2017)
+#### Changed
+- Performing connection validity checks only on main package queue.
+
+---
+
 ### Version 4.11.2 (14th March 2017)
 #### Changed
 - Changed key name used to save persistent UUID to be unique per app.
diff --git a/README.md b/README.md
index 660382267..dbf01d61c 100644
--- a/README.md
+++ b/README.md
@@ -81,13 +81,13 @@ In the dialog `Choose options for adding these files` make sure to check the che
 If you're using [CocoaPods][cocoapods], you can add the following line to your `Podfile` and continue from [this step](#sdk-integrate):
 
 ```ruby
-pod 'Adjust', '~> 4.11.2'
+pod 'Adjust', '~> 4.11.3'
 ```
 
 or:
 
 ```ruby
-pod 'Adjust', :git => 'https://github.com/adjust/ios_sdk.git', :tag => 'v4.11.2'
+pod 'Adjust', :git => 'https://github.com/adjust/ios_sdk.git', :tag => 'v4.11.3'
 ```
 
 --
diff --git a/VERSION b/VERSION
index 4f89fb960..e9fdaa8c8 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.11.2
+4.11.3
diff --git a/doc/english/migrate.md b/doc/english/migrate.md
index 4a62cf593..7b829cd29 100644
--- a/doc/english/migrate.md
+++ b/doc/english/migrate.md
@@ -1,4 +1,4 @@
-## Migrate your adjust SDK for iOS to v4.11.2 from v3.4.0
+## Migrate your adjust SDK for iOS to v4.11.3 from v3.4.0
 
 ### Initial setup
 
diff --git a/doc/japanese/migrate_ja.md b/doc/japanese/migrate_ja.md
index 4fda2d3ea..b70a3c28a 100644
--- a/doc/japanese/migrate_ja.md
+++ b/doc/japanese/migrate_ja.md
@@ -1,4 +1,4 @@
-## iOS用adjust SDKのv3.4.0からv.4.11.2への移行
+## iOS用adjust SDKのv3.4.0からv.4.11.3への移行
 
 ### 初期設定
 
diff --git a/doc/migrate.md b/doc/migrate.md
index 4a62cf593..7b829cd29 100644
--- a/doc/migrate.md
+++ b/doc/migrate.md
@@ -1,4 +1,4 @@
-## Migrate your adjust SDK for iOS to v4.11.2 from v3.4.0
+## Migrate your adjust SDK for iOS to v4.11.3 from v3.4.0
 
 ### Initial setup