diff --git a/Assets/Mochineko/VoiceActivityDetection/UnityMicrophoneSource.cs b/Assets/Mochineko/VoiceActivityDetection/UnityMicrophoneSource.cs
index 0f4f2e1..bef01af 100644
--- a/Assets/Mochineko/VoiceActivityDetection/UnityMicrophoneSource.cs
+++ b/Assets/Mochineko/VoiceActivityDetection/UnityMicrophoneSource.cs
@@ -19,6 +19,8 @@ public sealed class UnityMicrophoneSource : IVoiceSource
         private int lastPosition;
         private bool isActive = true;
 
+        private readonly object lockObject = new();
+
         private readonly Subject<VoiceSegment> onSegmentRead = new();
         IObservable<VoiceSegment> IVoiceSource.OnSegmentRead => onSegmentRead;
 
@@ -37,7 +39,8 @@ public UnityMicrophoneSource(
         {
             if (readBufferSize <= 0)
             {
-                throw new ArgumentOutOfRangeException(nameof(readBufferSize), readBufferSize, "Read buffer size must be greater than 0.");
+                throw new ArgumentOutOfRangeException(nameof(readBufferSize), readBufferSize,
+                    "Read buffer size must be greater than 0.");
             }
 
             this.proxy = proxy;
@@ -54,32 +57,35 @@ void IDisposable.Dispose()
 
         void IVoiceSource.Update()
         {
-            currentPosition = this.proxy.GetSamplePosition();
-            if (currentPosition < 0)
+            lock (lockObject)
             {
-                lastPosition = 0;
-                return;
-            }
+                currentPosition = this.proxy.GetSamplePosition();
+                if (currentPosition < 0)
+                {
+                    lastPosition = 0;
+                    return;
+                }
 
-            if (!isActive)
-            {
-                return;
-            }
+                if (!isActive)
+                {
+                    return;
+                }
 
-            // No update of microphone audio
-            if (currentPosition == lastPosition)
-            {
-                return;
-            }
+                // No update of microphone audio
+                if (currentPosition == lastPosition)
+                {
+                    return;
+                }
 
-            // Write current all data to loop buffer
-            this.audioClip.GetData(this.loopBuffer, offsetSamples: 0);
+                // Write current all data to loop buffer
+                this.audioClip.GetData(this.loopBuffer, offsetSamples: 0);
 
-            // Read samples from last position to current position
-            ReadCurrentSamples();
+                // Read samples from last position to current position
+                ReadCurrentSamples();
 
-            // Update last position
-            lastPosition = currentPosition;
+                // Update last position
+                lastPosition = currentPosition;
+            }
         }
 
         void IVoiceSource.SetSourceActive(bool isActive)
diff --git a/Assets/Mochineko/VoiceActivityDetection/package.json b/Assets/Mochineko/VoiceActivityDetection/package.json
index fe6540f..fecd6c4 100644
--- a/Assets/Mochineko/VoiceActivityDetection/package.json
+++ b/Assets/Mochineko/VoiceActivityDetection/package.json
@@ -1,6 +1,6 @@
 {
   "name": "com.mochineko.voice-activity-detection",
-  "version": "0.3.1",
+  "version": "0.3.2",
   "displayName": "Voice Activity Detection",
   "description": "A voice activity detection library for Unity.",
   "unity": "2022.3",
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fc2cf37..6d11564 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,9 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.3.2] - 2023-09-05
+
+### Fixed
+- Fix multi-thread conflict in `UnityMicrophoneSource.Update`.
+
 ## [0.3.1] - 2023-08-01
 
-## Changed
+### Changed
 - Improve timing to change flag of voice activity in `QueueingVoiceActivityDetector`.
 - Introduce array pool to avoid conflicting resources with multi-threading.
 
diff --git a/README.md b/README.md
index e874ef2..32bab47 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Add following dependencies to your `/Packages/manifest.json`.
 ```json
 {
     "dependencies": {
-        "com.mochineko.voice-activity-detection": "https://github.com/mochi-neko/voice-activity-detection-unity.git?path=/Assets/Mochineko/VoiceActivityDetection#0.3.1",
+        "com.mochineko.voice-activity-detection": "https://github.com/mochi-neko/voice-activity-detection-unity.git?path=/Assets/Mochineko/VoiceActivityDetection#0.3.2",
         "com.cysharp.unitask": "https://github.com/Cysharp/UniTask.git?path=src/UniTask/Assets/Plugins/UniTask",
         "com.neuecc.unirx": "https://github.com/neuecc/UniRx.git?path=Assets/Plugins/UniRx/Scripts",
         "com.naudio.core": "https://github.com/mochi-neko/simple-audio-codec-unity.git?path=/Assets/NAudio/NAudio.Core#0.2.0",