diff --git a/Assets/Adjust/Android/AdjustAndroid.cs b/Assets/Adjust/Android/AdjustAndroid.cs
index 92b7ecb3..61f8d735 100644
--- a/Assets/Adjust/Android/AdjustAndroid.cs
+++ b/Assets/Adjust/Android/AdjustAndroid.cs
@@ -8,7 +8,7 @@ namespace com.adjust.sdk
 #if UNITY_ANDROID
     public class AdjustAndroid
     {
-        private const string sdkPrefix = "unity4.38.0";
+        private const string sdkPrefix = "unity4.38.1";
         private static bool launchDeferredDeeplink = true;
         private static AndroidJavaClass ajcAdjust = new AndroidJavaClass("com.adjust.sdk.Adjust");
         private static AndroidJavaObject ajoCurrentActivity = new AndroidJavaClass("com.unity3d.player.UnityPlayer").GetStatic<AndroidJavaObject>("currentActivity");
diff --git a/Assets/Adjust/Android/adjust-android.jar b/Assets/Adjust/Android/adjust-android.jar
index 29803a0b..f957787d 100644
Binary files a/Assets/Adjust/Android/adjust-android.jar and b/Assets/Adjust/Android/adjust-android.jar differ
diff --git a/Assets/Adjust/Windows/AdjustWindows.cs b/Assets/Adjust/Windows/AdjustWindows.cs
index a1762a81..df5f94dd 100644
--- a/Assets/Adjust/Windows/AdjustWindows.cs
+++ b/Assets/Adjust/Windows/AdjustWindows.cs
@@ -17,7 +17,7 @@ namespace com.adjust.sdk
 {
     public class AdjustWindows
     {
-        private const string sdkPrefix = "unity4.38.0";
+        private const string sdkPrefix = "unity4.38.1";
         private static bool appLaunched = false;
 
         public static void Start(AdjustConfig adjustConfig)
diff --git a/Assets/Adjust/iOS/Adjust.h b/Assets/Adjust/iOS/Adjust.h
index 47517abb..d4b1039c 100644
--- a/Assets/Adjust/iOS/Adjust.h
+++ b/Assets/Adjust/iOS/Adjust.h
@@ -2,7 +2,7 @@
 //  Adjust.h
 //  Adjust SDK
 //
-//  V4.38.0
+//  V4.38.2
 //  Created by Christian Wellenbrock (@wellle) on 23rd July 2013.
 //  Copyright (c) 2012-2021 Adjust GmbH. All rights reserved.
 //
diff --git a/Assets/Adjust/iOS/AdjustSdk.a b/Assets/Adjust/iOS/AdjustSdk.a
index 807ed05f..9e7cc051 100644
Binary files a/Assets/Adjust/iOS/AdjustSdk.a and b/Assets/Adjust/iOS/AdjustSdk.a differ
diff --git a/Assets/Adjust/iOS/AdjustiOS.cs b/Assets/Adjust/iOS/AdjustiOS.cs
index 40fb33ff..b2730e92 100644
--- a/Assets/Adjust/iOS/AdjustiOS.cs
+++ b/Assets/Adjust/iOS/AdjustiOS.cs
@@ -8,7 +8,7 @@ namespace com.adjust.sdk
 #if UNITY_IOS
     public class AdjustiOS
     {
-        private const string sdkPrefix = "unity4.38.0";
+        private const string sdkPrefix = "unity4.38.1";
 
         [DllImport("__Internal")]
         private static extern void _AdjustLaunchApp(
diff --git a/Assets/AdjustOaid/Android/adjust-android-oaid.jar b/Assets/AdjustOaid/Android/adjust-android-oaid.jar
index 7ee8157e..51fb17b2 100644
Binary files a/Assets/AdjustOaid/Android/adjust-android-oaid.jar and b/Assets/AdjustOaid/Android/adjust-android-oaid.jar differ
diff --git a/CHANGELOG.md b/CHANGELOG.md
index a3f99548..f7e41bf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,14 @@
+### Version 4.38.1 (30th April 2024)
+#### Added
+- Added sending of the additional iOS SDK observability parameters for debugging purposes.
+
+#### Native SDKs
+- [iOS@v4.38.2][ios_sdk_v4.38.2]
+- [Android@v4.38.3][android_sdk_v4.38.3]
+- [Windows@v4.17.0][windows_sdk_v4.17.0]
+
+---
+
 ### Version 4.38.0 (8th April 2024)
 #### Added
 - Added new domains and corresponding payload restrictions for the Adjust SDK to direct the iOS traffic to:
@@ -38,6 +49,7 @@
 - [iOS@v4.37.1][ios_sdk_v4.37.1]
 - [Android@v4.38.1][android_sdk_v4.38.1]
 - [Windows@v4.17.0][windows_sdk_v4.17.0]
+
 ---
 
 ### Version 4.37.0 (16th January 2024)
@@ -49,6 +61,7 @@
 - [iOS@v4.37.0][ios_sdk_v4.37.0]
 - [Android@v4.38.0][android_sdk_v4.38.0]
 - [Windows@v4.17.0][windows_sdk_v4.17.0]
+
 ---
 
 ### Version 4.36.0 (24th November 2023)
@@ -64,6 +77,7 @@
 - [iOS@v4.36.0][ios_sdk_v4.36.0]
 - [Android@v4.37.0][android_sdk_v4.37.0]
 - [Windows@v4.17.0][windows_sdk_v4.17.0]
+
 ---
 
 ### Version 4.35.2 (9th October 2023)
@@ -74,6 +88,7 @@
 - [iOS@v4.35.2][ios_sdk_v4.35.2]
 - [Android@v4.35.1][android_sdk_v4.35.1]
 - [Windows@v4.17.0][windows_sdk_v4.17.0]
+
 ---
 
 ### Version 4.35.1 (2nd October 2023)
@@ -1243,6 +1258,7 @@ Kudos to [Ivan](https://github.com/MatkovIvan) and [Evgeny](https://github.com/e
 [ios_sdk_v4.37.1]: https://github.com/adjust/ios_sdk/tree/v4.37.1
 [ios_sdk_v4.37.2]: https://github.com/adjust/ios_sdk/tree/v4.37.2
 [ios_sdk_v4.38.0]: https://github.com/adjust/ios_sdk/tree/v4.38.0
+[ios_sdk_v4.38.2]: https://github.com/adjust/ios_sdk/tree/v4.38.2
 
 [android_sdk_v3.5.0]: https://github.com/adjust/android_sdk/tree/v3.5.0
 [android_sdk_v4.1.0]: https://github.com/adjust/android_sdk/tree/v4.1.0
diff --git a/VERSION b/VERSION
index fff125e7..bcdb5803 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.38.0
+4.38.1
diff --git a/doc/english/migration/migrate.md b/doc/english/migration/migrate.md
index e7239090..28649ba5 100644
--- a/doc/english/migration/migrate.md
+++ b/doc/english/migration/migrate.md
@@ -1,4 +1,4 @@
-## Migrate your Adjust SDK for Unity3d to 4.38.0 from 3.4.4
+## Migrate your Adjust SDK for Unity3d to 4.38.1 from 3.4.4
 
 ### Migration procedure
 
diff --git a/ext/ios/sdk b/ext/ios/sdk
index 3ebb6fe1..2fd82b11 160000
--- a/ext/ios/sdk
+++ b/ext/ios/sdk
@@ -1 +1 @@
-Subproject commit 3ebb6fe16fa67d5307bdafc93005d006bfa5fb74
+Subproject commit 2fd82b11e329e9c8357eaa77e28799ca2d629ab5