diff --git a/Adjust.podspec b/Adjust.podspec
index bfd70afc4..75a9b30f5 100644
--- a/Adjust.podspec
+++ b/Adjust.podspec
@@ -1,11 +1,11 @@
 Pod::Spec.new do |s|
   s.name           = "Adjust"
-  s.version        = "4.33.5"
+  s.version        = "4.33.6"
   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         = { "Adjust" => "sdk@adjust.com" }
-  s.source         = { :git => "https://github.com/adjust/ios_sdk.git", :tag => "v4.33.5" }
+  s.source         = { :git => "https://github.com/adjust/ios_sdk.git", :tag => "v4.33.6" }
   s.ios.deployment_target = '9.0'
   s.tvos.deployment_target = '9.0'
   s.framework      = 'SystemConfiguration'
diff --git a/Adjust/ADJUtil.m b/Adjust/ADJUtil.m
index 132a46987..840169665 100644
--- a/Adjust/ADJUtil.m
+++ b/Adjust/ADJUtil.m
@@ -35,7 +35,7 @@
 static NSRegularExpression *shortUniversalLinkRegex = nil;
 static NSRegularExpression *excludedDeeplinkRegex = nil;
 
-static NSString * const kClientSdk                  = @"ios4.33.5";
+static NSString * const kClientSdk                  = @"ios4.33.6";
 static NSString * const kDeeplinkParam              = @"deep_link=";
 static NSString * const kSchemeDelimiter            = @"://";
 static NSString * const kDefaultScheme              = @"AdjustUniversalScheme";
@@ -1191,7 +1191,7 @@ + (int)attStatus {
             NSMethodSignature *msAuthorization = [appTrackingClass methodSignatureForSelector:selAuthorization];
             NSInvocation *invAuthorization = [NSInvocation invocationWithMethodSignature:msAuthorization];
             [invAuthorization setSelector:selAuthorization];
-            [invAuthorization invokeWithTarget:appTrackingClass];
+            [invAuthorization setTarget:appTrackingClass];
             [invAuthorization invoke];
             NSUInteger status;
             [invAuthorization getReturnValue:&status];
@@ -1431,9 +1431,10 @@ + (NSMutableDictionary *)deepCopyOfDictionary:(NSMutableDictionary *)dictionary
         return nil;
     }
 
-    NSMutableDictionary *deepCopy = (__bridge NSMutableDictionary *)CFPropertyListCreateDeepCopy(NULL,
-                                                                                                 (__bridge CFDictionaryRef)dictionary,
-                                                                                                 kCFPropertyListMutableContainersAndLeaves);
+    NSMutableDictionary *deepCopy =
+    (NSMutableDictionary *)CFBridgingRelease(CFPropertyListCreateDeepCopy(kCFAllocatorDefault,
+                                                                          (CFDictionaryRef)dictionary,
+                                                                          kCFPropertyListMutableContainersAndLeaves));
     return deepCopy;
 }
 
diff --git a/Adjust/Adjust.h b/Adjust/Adjust.h
index 419999a12..4bde4847a 100644
--- a/Adjust/Adjust.h
+++ b/Adjust/Adjust.h
@@ -2,7 +2,7 @@
 //  Adjust.h
 //  Adjust SDK
 //
-//  V4.33.5
+//  V4.33.6
 //  Created by Christian Wellenbrock (@wellle) on 23rd July 2013.
 //  Copyright (c) 2012-2021 Adjust GmbH. All rights reserved.
 //
diff --git a/AdjustBridge/AdjustBridgeRegister.m b/AdjustBridge/AdjustBridgeRegister.m
index ca1600ad8..c9f6911f3 100644
--- a/AdjustBridge/AdjustBridgeRegister.m
+++ b/AdjustBridge/AdjustBridgeRegister.m
@@ -275,7 +275,7 @@ + (NSString *)adjust_js {
                 if (this.sdkPrefix) {
                     return this.sdkPrefix;
                 } else {
-                    return 'web-bridge4.33.5';
+                    return 'web-bridge4.33.6';
                 }
             },
             setTestOptions: function(testOptions) {
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53ae2d1d4..8ccdcba10 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+### Version 4.33.6 (25th July 2023)
+#### Fixed
+- Fixed memory leak occurrences when tracking events (https://github.com/adjust/ios_sdk/issues/668).
+
+---
+
 ### Version 4.33.5 (13th July 2023)
 #### Changed
 - Replaced the usage of `drand48()` with `arc4random_uniform` method.
diff --git a/VERSION b/VERSION
index bbbc18ea5..aba0abb01 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.33.5
+4.33.6
diff --git a/examples/AdjustExample-ObjC/AdjustExample-ObjC.xcodeproj/xcshareddata/xcschemes/AdjustExample-ObjC.xcscheme b/examples/AdjustExample-ObjC/AdjustExample-ObjC.xcodeproj/xcshareddata/xcschemes/AdjustExample-ObjC.xcscheme
index 3252f8899..ce288a595 100644
--- a/examples/AdjustExample-ObjC/AdjustExample-ObjC.xcodeproj/xcshareddata/xcschemes/AdjustExample-ObjC.xcscheme
+++ b/examples/AdjustExample-ObjC/AdjustExample-ObjC.xcodeproj/xcshareddata/xcschemes/AdjustExample-ObjC.xcscheme
@@ -50,6 +50,13 @@
             ReferencedContainer = "container:AdjustExample-ObjC.xcodeproj">
          </BuildableReference>
       </BuildableProductRunnable>
+      <AdditionalOptions>
+         <AdditionalOption
+            key = "MallocScribble"
+            value = ""
+            isEnabled = "YES">
+         </AdditionalOption>
+      </AdditionalOptions>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
diff --git a/examples/AdjustExample-Swift/Podfile.lock b/examples/AdjustExample-Swift/Podfile.lock
index ae8cd8631..c97241b82 100644
--- a/examples/AdjustExample-Swift/Podfile.lock
+++ b/examples/AdjustExample-Swift/Podfile.lock
@@ -1,7 +1,7 @@
 PODS:
-  - Adjust (4.33.5):
-    - Adjust/Core (= 4.33.5)
-  - Adjust/Core (4.33.5)
+  - Adjust (4.33.6):
+    - Adjust/Core (= 4.33.6)
+  - Adjust/Core (4.33.6)
 
 DEPENDENCIES:
   - Adjust (from `../../`)
@@ -11,7 +11,7 @@ EXTERNAL SOURCES:
     :path: "../../"
 
 SPEC CHECKSUMS:
-  Adjust: 4690e07ea401ee56d4d3f4f5bdad86c94f51903f
+  Adjust: c3b6c3734928a617fefce81dc223fd5f104162be
 
 PODFILE CHECKSUM: 4c79da456db9adb90cdd42adc7f721c7bb6490cd