diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 50d287ec6e..c648a413b1 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,6 +1,6 @@
 [versions]
 kotlin = "2.0.20"
-kotlinx-coroutines = "1.8.1"
+kotlinx-coroutines = "1.9.0"
 kotlinx-serialization = "1.7.2"
 androidx-activity = "1.9.2"
 androidx-compose-ui = "1.7.1"
diff --git a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/CodeSession.kt b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/CodeSession.kt
index 7450a4c356..bd5ce68130 100644
--- a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/CodeSession.kt
+++ b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/CodeSession.kt
@@ -20,7 +20,7 @@ import kotlin.coroutines.CoroutineContext
 import kotlinx.coroutines.CoroutineExceptionHandler
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.CoroutineStart
-import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.job
@@ -68,7 +68,7 @@ internal abstract class CodeSession<A : AppService>(
   /** Invoked on [TreehouseDispatchers.zipline]. */
   protected abstract fun ziplineStart()
 
-  @OptIn(ExperimentalCoroutinesApi::class)
+  @OptIn(DelicateCoroutinesApi::class)
   fun stop() {
     dispatchers.checkUi()
 
diff --git a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealTreehouseApp.kt b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealTreehouseApp.kt
index 97ad169cdc..a8ced5001d 100644
--- a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealTreehouseApp.kt
+++ b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/RealTreehouseApp.kt
@@ -25,7 +25,6 @@ import app.cash.zipline.loader.ZiplineHttpClient
 import app.cash.zipline.loader.ZiplineLoader
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.mapNotNull
@@ -108,7 +107,6 @@ internal class RealTreehouseApp<A : AppService> private constructor(
    * Continuously polls for updated code, and emits a new [LoadResult] instance when new code is
    * found.
    */
-  @OptIn(ExperimentalCoroutinesApi::class) // limitedParallelism is experimental.
   private fun ziplineFlow(
     eventListenerFactory: EventListener.Factory,
   ): Flow<LoadResult> {
diff --git a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/TreehouseAppContent.kt b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/TreehouseAppContent.kt
index d6f1704862..e1cc4001f3 100644
--- a/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/TreehouseAppContent.kt
+++ b/redwood-treehouse-host/src/commonMain/kotlin/app/cash/redwood/treehouse/TreehouseAppContent.kt
@@ -32,7 +32,7 @@ import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.CoroutineStart
-import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -504,7 +504,7 @@ private class ViewContentCodeBinding<A : AppService>(
     }
   }
 
-  @OptIn(ExperimentalCoroutinesApi::class)
+  @OptIn(DelicateCoroutinesApi::class)
   fun cancel(exception: Throwable?) {
     dispatchers.checkUi()