diff --git a/convention-plugins/src/main/kotlin/root.publication.gradle.kts b/convention-plugins/src/main/kotlin/root.publication.gradle.kts
index afad449..8391a14 100644
--- a/convention-plugins/src/main/kotlin/root.publication.gradle.kts
+++ b/convention-plugins/src/main/kotlin/root.publication.gradle.kts
@@ -3,7 +3,7 @@ plugins {
 }
 object Conf {
     const val GROUP = "net.kigawa"
-    const val VERSION = "3.1.0"
+    const val VERSION = "3.2.0"
 }
 
 group = Conf.GROUP
diff --git a/hakate/src/commonMain/kotlin/net/kigawa/hakate/api/state/StateContext.kt b/hakate/src/commonMain/kotlin/net/kigawa/hakate/api/state/StateContext.kt
index fce27e4..7d18e8b 100644
--- a/hakate/src/commonMain/kotlin/net/kigawa/hakate/api/state/StateContext.kt
+++ b/hakate/src/commonMain/kotlin/net/kigawa/hakate/api/state/StateContext.kt
@@ -5,6 +5,7 @@ import kotlinx.coroutines.Job
 import net.kigawa.hakate.impl.state.MergedStateContextImpl
 
 interface StateContext {
+    val coroutineScope: CoroutineScope
     fun launch(block: suspend CoroutineScope.() -> Unit): Job
     fun dispatcher(): StateDispatcher
     fun dispatch(block: suspend StateContext.() -> Unit): Job
@@ -18,4 +19,5 @@ interface StateContext {
     fun merge(other: StateContext): StateContext {
         return MergedStateContextImpl(this, other)
     }
+    fun newStateContext(): StateContext
 }
\ No newline at end of file
diff --git a/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/MergedStateContextImpl.kt b/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/MergedStateContextImpl.kt
index 88ba43c..baa64aa 100644
--- a/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/MergedStateContextImpl.kt
+++ b/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/MergedStateContextImpl.kt
@@ -1,17 +1,19 @@
 package net.kigawa.hakate.impl.state
 
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
+import kotlinx.coroutines.*
 import net.kigawa.hakate.api.state.StateContext
 import net.kigawa.hakate.api.state.StateDispatcher
 import net.kigawa.hakate.impl.Utl.suspendApply
+import kotlin.coroutines.EmptyCoroutineContext
 
 class MergedStateContextImpl(
     private val first: StateContext,
     private val second: StateContext,
 ) : StateContext {
+    override val coroutineScope: CoroutineScope = CoroutineScope(
+        first.coroutineScope.newCoroutineContext(second.coroutineScope.coroutineContext)
+    )
+
     override fun launch(block: suspend CoroutineScope.() -> Unit): Job {
         return first.launch {
             val f = this
@@ -37,4 +39,11 @@ class MergedStateContextImpl(
         first.cancel()
         second.cancel()
     }
+
+    override fun newStateContext(): StateContext {
+        return StateContextImpl(
+            dispatcher(),
+            CoroutineScope(coroutineScope.newCoroutineContext(EmptyCoroutineContext))
+        )
+    }
 }
\ No newline at end of file
diff --git a/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/StateContextImpl.kt b/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/StateContextImpl.kt
index 99d7ee3..a3168bc 100644
--- a/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/StateContextImpl.kt
+++ b/hakate/src/commonMain/kotlin/net/kigawa/hakate/impl/state/StateContextImpl.kt
@@ -1,16 +1,14 @@
 package net.kigawa.hakate.impl.state
 
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.cancel
-import kotlinx.coroutines.launch
+import kotlinx.coroutines.*
 import net.kigawa.hakate.api.state.StateContext
 import net.kigawa.hakate.api.state.StateDispatcher
 import net.kigawa.hakate.impl.Utl.suspendApply
+import kotlin.coroutines.EmptyCoroutineContext
 
 class StateContextImpl(
     private val dispatcher: StateDispatcher,
-    val coroutineScope: CoroutineScope,
+    override val coroutineScope: CoroutineScope,
 ) : StateContext {
     override fun launch(block: suspend CoroutineScope.() -> Unit): Job {
         return coroutineScope.launch(block = block)
@@ -30,4 +28,8 @@ class StateContextImpl(
     override fun cancel() {
         coroutineScope.cancel("cancel by StateContext")
     }
+
+    override fun newStateContext(): StateContext {
+        return StateContextImpl(dispatcher, CoroutineScope(coroutineScope.newCoroutineContext(EmptyCoroutineContext)))
+    }
 }
\ No newline at end of file