diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b5204d7..ff237e4 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,13 +12,13 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-15]
+        os: [macos-26]
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Select Xcode
-        run: sudo xcode-select -s /Applications/Xcode_26.3.app
+        run: sudo xcode-select -s /Applications/Xcode_26.5.app
 
       - name: Show Swift version
         run: swift --version
diff --git a/Sources/EffectView/EffectObservable/EffectObservable.swift b/Sources/EffectView/EffectObservable/EffectObservable.swift
index d435ffe..688a06d 100644
--- a/Sources/EffectView/EffectObservable/EffectObservable.swift
+++ b/Sources/EffectView/EffectObservable/EffectObservable.swift
@@ -34,7 +34,7 @@ public final class EffectObservable<
     internal(set) public var state: State
 
     @ObservationIgnored
-    private var send: Send?
+    private var runtimeSend: Send?
     @ObservationIgnored
     nonisolated(unsafe) private var runtimeUnavailable: RuntimeUnavailable?
     @ObservationIgnored
@@ -71,11 +71,11 @@ public final class EffectObservable<
             env: env
         )
         self._input = Input(self)
-        self.send = send
+        self.runtimeSend = send
         if let event = initialEvent {
             Task {
                 do {
-                    try await send(event, input: _input, continuation: nil)
+                    try await send(event, input: _input)
                 } catch {
                     print("could not process initial event: \(error)")
                     // TODO: consider sending a control event
@@ -84,6 +84,7 @@ public final class EffectObservable<
         }
     }
     
+    @_optimize(none) // https://github.com/swiftlang/swift/issues/82523
     isolated deinit {
         cancel()
     }
@@ -117,11 +118,11 @@ public final class EffectObservable<
     ///   critical failure, or `CancellationError` if accepted work is later cancelled.
     public func send(_ event: Event) async throws {
         try checkRuntimeAvailability()
-        guard let send = send else {
+        guard let send = runtimeSend else {
             throw RuntimeUnavailable.actorCancelled
         }
         do {
-            try await send(event, input: _input, continuation: nil)
+            try await send(event, input: _input)
         } catch {
             let boundaryError = runtimeBoundaryError(for: error)
             if let runtimeUnavailable = boundaryError as? RuntimeUnavailable {
@@ -184,7 +185,7 @@ public final class EffectObservable<
         // TODO: consider to to add a Task cancellation handler which sends a corresponding control event to the transducer.
         // The transducer's action on this is currently "implementation defined". It *could* have no effect on the task operation, or it *could* cancel it.
         try checkRuntimeAvailability()
-        guard let send = self.send, let input = _input else {
+        guard let send = self.runtimeSend, let input = _input else {
             throw RuntimeUnavailable.actorCancelled
         }
         return try await withCheckedThrowingContinuation { (continuation: Continuation<Output>) in
@@ -246,7 +247,7 @@ public final class EffectObservable<
 
         runtimeUnavailable = .actorCancelled
 
-        guard let send else {
+        guard let send = runtimeSend else {
             return
         }