diff --git a/shell/plugins/notifications/NotificationLogic.js b/shell/plugins/notifications/NotificationLogic.js
index 128369de..0e428641 100644
--- a/shell/plugins/notifications/NotificationLogic.js
+++ b/shell/plugins/notifications/NotificationLogic.js
@@ -92,6 +92,17 @@ function snapshotOf(notification, timestamp) {
   }
 }
 
+// A client updating a notification through replaces_id keeps the identity of
+// the popup it took over: the file name is the timestamp and id the popup was
+// first persisted under, and the restore, replace and archive paths all key
+// off that name. Only what the card draws comes from the updated object.
+function replacementSnapshot(notification, originalId, timestamp) {
+  var updated = snapshotOf(notification, timestamp)
+  updated.id = originalId
+  updated.originalId = originalId
+  return updated
+}
+
 function historyEntry(value, normalUrgency) {
   var e = value || {}
   return {
@@ -265,6 +276,7 @@ if (typeof module !== "undefined") {
     execFromHints: execFromHints,
     shouldRenderCompactGlyph: shouldRenderCompactGlyph,
     snapshotOf: snapshotOf,
+    replacementSnapshot: replacementSnapshot,
     historyEntry: historyEntry,
     parseSettings: parseSettings,
     historyRows: historyRows,
diff --git a/shell/plugins/notifications/Service.qml b/shell/plugins/notifications/Service.qml
index 0e810552..e3245b6f 100644
--- a/shell/plugins/notifications/Service.qml
+++ b/shell/plugins/notifications/Service.qml
@@ -177,6 +177,7 @@ Item {
     }
 
     persistPopupFile(snapshot)
+    watchForUpdates(notification, snapshot)
     // Qt.callLater avoids "QV4::Object::insertMember" crashes when a
     // Repeater is mid-incubation while we mutate its model.
     Qt.callLater(function() {
@@ -185,6 +186,63 @@ Item {
     })
   }
 
+  // Everything the card draws. A change to any of these is a client updating
+  // the notification in place, which is the only kind of update we ever hear
+  // about after the popup exists.
+  readonly property var updateSignals: [
+    "summaryChanged", "bodyChanged", "appNameChanged", "appIconChanged",
+    "imageChanged", "urgencyChanged", "expireTimeoutChanged", "hintsChanged"
+  ]
+
+  // A client that updates a notification through replaces_id does not produce
+  // a second onNotification: the server writes the new content onto the object
+  // we are already holding. The card draws a snapshot copied out of that
+  // object — deliberately, since the object itself must stay out of the model
+  // — so nothing reaches the screen until we copy it again.
+  function watchForUpdates(notification, snapshot) {
+    function refresh() {
+      service.refreshPopup(notification, snapshot.originalId, snapshot.timestamp)
+    }
+
+    for (var i = 0; i < updateSignals.length; i++) {
+      var signal = notification[updateSignals[i]]
+      if (signal && typeof signal.connect === "function") signal.connect(refresh)
+    }
+  }
+
+  function refreshPopup(notification, originalId, timestamp) {
+    // A newer notification may have taken this id over, and the object may
+    // outlive its popup — in both cases there is nothing here to refresh.
+    if (service.liveRefs[originalId] !== notification) return
+
+    var updated
+    try {
+      updated = NotificationLogic.replacementSnapshot(notification, originalId, timestamp)
+    } catch (e) {
+      // Object torn down by the server while the signal was in flight.
+      return
+    }
+
+    for (var i = 0; i < popupModel.count; i++) {
+      var row = popupModel.get(i)
+      if (!row || row.originalId !== originalId || row.timestamp !== timestamp) continue
+      popupModel.setProperty(i, "app", updated.app)
+      popupModel.setProperty(i, "appIcon", updated.appIcon)
+      popupModel.setProperty(i, "summary", updated.summary)
+      popupModel.setProperty(i, "body", updated.body)
+      popupModel.setProperty(i, "image", updated.image)
+      popupModel.setProperty(i, "glyph", updated.glyph)
+      popupModel.setProperty(i, "exec", updated.exec)
+      popupModel.setProperty(i, "urgency", updated.urgency)
+      popupModel.setProperty(i, "expireTimeout", updated.expireTimeout)
+      // The file name is the timestamp and id this popup was persisted under,
+      // so the rewrite lands on the same file: a restart restores the version
+      // last shown, and so does the copy that ends up in history.
+      persistPopupFile(updated)
+      return
+    }
+  }
+
   // A restored row carries an id from the previous server generation, and
   // the new server hands out ids from 1 again — so a fresh notification
   // with the same originalId is a coincidence, not the same notification.
@@ -809,6 +867,16 @@ Item {
             property real remainingLifetime: 1.0
             readonly property bool ticking: cardSlot.lifetime > 0 && !card.hovered
 
+            // A client updating this notification in place rewrites the row
+            // under the card (see refreshPopup). New text deserves a full look,
+            // so the countdown starts over instead of running out the clock the
+            // superseded text was already most of the way through. Delegates
+            // keep their own row as the model changes around them, so only a
+            // real content change lands here.
+            onSummaryChanged: cardSlot.remainingLifetime = 1.0
+            onBodyChanged: cardSlot.remainingLifetime = 1.0
+            onImageChanged: cardSlot.remainingLifetime = 1.0
+
             Timer {
               interval: 50
               repeat: true
diff --git a/test/shell.d/notifications-test.sh b/test/shell.d/notifications-test.sh
index 44692373..bd59750b 100644
--- a/test/shell.d/notifications-test.sh
+++ b/test/shell.d/notifications-test.sh
@@ -124,6 +124,53 @@ assertDeepEqual(
   'notifications create stable snapshots'
 )
 
+// An in-place update keeps the popup's identity — the file name it was
+// persisted under — and takes everything the card draws from the new content.
+const replacement = notifications.replacementSnapshot(
+  {
+    id: 12,
+    appName: 'Slack',
+    summary: 'Thread v2',
+    body: 'message 2',
+    image: 'file:///tmp/new.png',
+    hints: { 'omarchy-glyph': '!' },
+    urgency: 2,
+    expireTimeout: 4000
+  },
+  12,
+  12345
+)
+assertDeepEqual(
+  {
+    id: replacement.id,
+    originalId: replacement.originalId,
+    timestamp: replacement.timestamp,
+    summary: replacement.summary,
+    body: replacement.body,
+    image: replacement.image,
+    glyph: replacement.glyph,
+    urgency: replacement.urgency,
+    expireTimeout: replacement.expireTimeout
+  },
+  {
+    id: 12,
+    originalId: 12,
+    timestamp: 12345,
+    summary: 'Thread v2',
+    body: 'message 2',
+    image: 'file:///tmp/new.png',
+    glyph: '!',
+    urgency: 2,
+    expireTimeout: 4000
+  },
+  'notifications take updated content without moving the popup it replaces'
+)
+assertEqual(
+  notifications.popupFileName(replacement),
+  '12345-12.json',
+  'notifications keep the persisted file name across an in-place update'
+)
+
 const settings = notifications.parseSettings(JSON.stringify({ version: 3, dnd: true }))
 assertEqual(settings.dnd, true, 'notifications parse the persisted DND state')
 assertEqual(settings.legacy, false, 'notifications do not flag a current settings file as legacy')
@@ -315,6 +362,22 @@ assert(
   /service\.replayCarryOver = liveRowsForReplay\(\)/.test(serviceQml),
   'notifications service carries the toasts still on screen into the replay'
 )
+assert(
+  /watchForUpdates\(notification, snapshot\)/.test(serviceQml),
+  'notifications service watches a shown notification for in-place updates'
+)
+assert(
+  /if \(signal && typeof signal\.connect === "function"\) signal\.connect\(refresh\)/.test(serviceQml),
+  'notifications service refreshes the popup from every property the card draws'
+)
+assert(
+  /popupModel\.setProperty\(i, "summary", updated\.summary\)[\s\S]{0,600}?persistPopupFile\(updated\)/.test(serviceQml),
+  'notifications service rewrites both the row and its file when a notification is updated in place'
+)
+assert(
+  /onSummaryChanged: cardSlot\.remainingLifetime = 1\.0/.test(serviceQml),
+  'notifications service restarts the countdown when a toast is updated under it'
+)
 assert(
   /awk 1 \\"\$1\\"\/\*\.json 2>\/dev\/null \|\| true", "--", historyDir/.test(serviceQml),
   'notifications service replays history by reading the archived files'