diff --git a/src/lib/notification/updateToast.ts b/src/lib/notification/updateToast.ts
index e4c8e66e8..8b4abcbf9 100644
--- a/src/lib/notification/updateToast.ts
+++ b/src/lib/notification/updateToast.ts
@@ -32,16 +32,6 @@ export const setupUpdateToast = (
     return
   }
 
-  // swが更新できるときにトースト表示
-  const newWorker = registration.installing
-  if (newWorker) {
-    newWorker.addEventListener('statechange', () => {
-      if (newWorker.state !== 'installed') return
-      doCanUpdate()
-    })
-    return
-  }
-
   // swが更新できるときにトースト表示
   registration.addEventListener('updatefound', () => {
     const newWorker = registration.installing