diff --git a/Yattee/Services/Updates/SparkleUpdater.swift b/Yattee/Services/Updates/SparkleUpdater.swift
index 5d6272e5..cb66d60a 100644
--- a/Yattee/Services/Updates/SparkleUpdater.swift
+++ b/Yattee/Services/Updates/SparkleUpdater.swift
@@ -33,12 +33,12 @@ final class AppUpdater {
         didSet {
             guard oldValue != wantsBetaChannel else { return }
             UserDefaults.standard.set(wantsBetaChannel, forKey: Self.wantsBetaKey)
-            // Trigger re-check so the delegate re-reads channels. Deferred off
-            // the main thread — resetUpdateCycle may synchronously touch the
-            // scheduler's feed cache which can stutter SwiftUI scrolling.
-            let updater = self.updaterController.updater
-            Task.detached(priority: .utility) {
-                updater.resetUpdateCycle()
+            // Trigger re-check so the delegate re-reads channels. Deferred to
+            // a later main-actor turn so the feed-cache work doesn't run
+            // synchronously inside this didSet (which can stutter SwiftUI
+            // scrolling). Must stay on main: SPUUpdater is main-thread-only.
+            Task { @MainActor in
+                self.updaterController.updater.resetUpdateCycle()
             }
         }
     }