diff --git a/Runtime/Autopilot.cs b/Runtime/Autopilot.cs
index 6c128a5..78e0f17 100644
--- a/Runtime/Autopilot.cs
+++ b/Runtime/Autopilot.cs
@@ -1,9 +1,8 @@
-// Copyright (c) 2023-2024 DeNA Co., Ltd.
+// Copyright (c) 2023-2025 DeNA Co., Ltd.
 // This software is released under the MIT License.
 
 using System;
 using System.Collections;
-using System.Threading;
 using Cysharp.Threading.Tasks;
 using DeNA.Anjin.Settings;
 using DeNA.Anjin.Utilities;
@@ -28,10 +27,9 @@ public interface ITerminatable
         /// <param name="message">Log message string or terminate message</param>
         /// <param name="stackTrace">Stack trace when terminate by the log message</param>
         /// <param name="reporting">Call Reporter if true</param>
-        /// <param name="token">Cancellation token</param>
         /// <returns>A task awaits termination get completed</returns>
-        UniTask TerminateAsync(ExitCode exitCode, string message = null, string stackTrace = null,
-            bool reporting = true, CancellationToken token = default);
+        UniTaskVoid TerminateAsync(ExitCode exitCode, string message = null, string stackTrace = null,
+            bool reporting = true);
     }
 
     /// <summary>
@@ -144,7 +142,7 @@ private void DispatchByLoadedScenes()
         private IEnumerator Lifespan(int timeoutSec, ExitCode exitCode, string message)
         {
             yield return new WaitForSecondsRealtime(timeoutSec);
-            yield return UniTask.ToCoroutine(() => TerminateAsync(exitCode, message));
+            TerminateAsync(exitCode, message).Forget();
         }
 
         private void OnDestroy()
@@ -157,8 +155,8 @@ private void OnDestroy()
         }
 
         /// <inheritdoc/>
-        public async UniTask TerminateAsync(ExitCode exitCode, string message = null, string stackTrace = null,
-            bool reporting = true, CancellationToken token = default)
+        public async UniTaskVoid TerminateAsync(ExitCode exitCode, string message = null, string stackTrace = null,
+            bool reporting = true)
         {
             if (_isTerminating)
             {
@@ -176,7 +174,7 @@ public async UniTask TerminateAsync(ExitCode exitCode, string message = null, st
 
             if (reporting && _state.IsRunning && _settings.Reporter != null)
             {
-                await _settings.Reporter.PostReportAsync(message, stackTrace, exitCode, token);
+                await _settings.Reporter.PostReportAsync(message, stackTrace, exitCode);
             }
 
             Destroy(this.gameObject);
diff --git a/Tests/Runtime/AutopilotTest.cs b/Tests/Runtime/AutopilotTest.cs
index 53c826a..022f7b1 100644
--- a/Tests/Runtime/AutopilotTest.cs
+++ b/Tests/Runtime/AutopilotTest.cs
@@ -1,4 +1,4 @@
-// Copyright (c) 2023-2024 DeNA Co., Ltd.
+// Copyright (c) 2023-2025 DeNA Co., Ltd.
 // This software is released under the MIT License.
 
 using System.Collections.Generic;
@@ -97,7 +97,9 @@ public async Task TerminateAsync_DestroyedAutopilotAndAgentObjects()
             var agents = AgentInspector.Instances;
             Assume.That(agents, Is.Not.Empty, "Agents are running");
 
-            await autopilot.TerminateAsync(ExitCode.Normally, reporting: false);
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+            autopilot.TerminateAsync(ExitCode.Normally, reporting: false);
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
             await UniTask.NextFrame(); // wait for destroy
 
             autopilot = Object.FindObjectOfType<Autopilot>(); // re-find after terminated
@@ -138,7 +140,9 @@ public async Task TerminateAsync_NoReporting_NotCallReporter()
             await UniTask.Delay(500); // wait for launch
 
             var autopilot = Autopilot.Instance;
-            await autopilot.TerminateAsync(ExitCode.Normally, null, null, false);
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+            autopilot.TerminateAsync(ExitCode.Normally, null, null, false);
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
 
             Assert.That(spyReporter.IsCalled, Is.False);
         }
@@ -153,7 +157,9 @@ public async Task TerminateAsync_Reporting_CallReporter()
             await UniTask.Delay(500); // wait for launch
 
             var autopilot = Autopilot.Instance;
-            await autopilot.TerminateAsync(ExitCode.Normally, "message", "stack trace", true);
+#pragma warning disable CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
+            autopilot.TerminateAsync(ExitCode.Normally, "message", "stack trace", true);
+#pragma warning restore CS4014 // Because this call is not awaited, execution of the current method continues before the call is completed
 
             Assert.That(spyReporter.IsCalled, Is.True);
             Assert.That(spyReporter.Arguments["exitCode"], Is.EqualTo("Normally"));
diff --git a/Tests/Runtime/TestDoubles/SpyTerminatable.cs b/Tests/Runtime/TestDoubles/SpyTerminatable.cs
index 4131de2..ca4632d 100644
--- a/Tests/Runtime/TestDoubles/SpyTerminatable.cs
+++ b/Tests/Runtime/TestDoubles/SpyTerminatable.cs
@@ -1,7 +1,6 @@
-// Copyright (c) 2023-2024 DeNA Co., Ltd.
+// Copyright (c) 2023-2025 DeNA Co., Ltd.
 // This software is released under the MIT License.
 
-using System.Threading;
 using Cysharp.Threading.Tasks;
 
 namespace DeNA.Anjin.TestDoubles
@@ -14,8 +13,8 @@ public class SpyTerminatable : ITerminatable
         public string CapturedStackTrace { get; private set; }
         public bool CapturedReporting { get; private set; }
 
-        public async UniTask TerminateAsync(ExitCode exitCode, string message = null, string stackTrace = null,
-            bool reporting = true, CancellationToken token = default)
+        public async UniTaskVoid TerminateAsync(ExitCode exitCode, string message = null, string stackTrace = null,
+            bool reporting = true)
         {
             IsCalled = true;
             CapturedExitCode = exitCode;