diff --git a/src/Status.php b/src/Status.php
index 32c0f795..1b82c298 100644
--- a/src/Status.php
+++ b/src/Status.php
@@ -7,9 +7,13 @@
 use Cachet\Enums\SystemStatusEnum;
 use Cachet\Models\Component;
 use Cachet\Models\Incident;
+use Cachet\Models\Schedule;
+use Cachet\Models\Update;
 use Cachet\Settings\AppSettings;
 use Carbon\CarbonInterface;
 use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Relations\Relation;
+use Illuminate\Support\Facades\Date;
 
 class Status
 {
@@ -104,14 +108,27 @@ public function incidents(): object
     }
 
     /**
-     * Get the most recent update timestamp across enabled components.
+     * Get the most recent guest-visible activity timestamp across components,
+     * incidents, incident updates and schedules.
      */
     public function lastUpdated(): ?CarbonInterface
     {
-        return Component::query()
-            ->enabled()
-            ->latest('updated_at')
-            ->first(['updated_at'])?->updated_at;
+        return collect([
+            Component::query()->enabled()->max('updated_at'),
+            Incident::query()->viewableBy(false)->max('updated_at'),
+            Schedule::query()->published()->max('updated_at'),
+            Update::query()
+                ->where('updateable_type', Relation::getMorphAlias(Incident::class))
+                ->whereIn('updateable_id', Incident::query()->viewableBy(false)->select('id'))
+                ->max('updated_at'),
+            Update::query()
+                ->where('updateable_type', Relation::getMorphAlias(Schedule::class))
+                ->whereIn('updateable_id', Schedule::query()->published()->select('id'))
+                ->max('updated_at'),
+        ])
+            ->filter()
+            ->map(fn ($timestamp): CarbonInterface => Date::parse($timestamp))
+            ->max();
     }
 
     /**
diff --git a/tests/Unit/StatusTest.php b/tests/Unit/StatusTest.php
index fbcd06ce..7fee3e35 100644
--- a/tests/Unit/StatusTest.php
+++ b/tests/Unit/StatusTest.php
@@ -121,6 +121,60 @@
         ->toEqual($component->updated_at);
 });
 
+it('considers incidents, incident updates and schedules when calculating the last updated timestamp', function () {
+    expect((new Status)->lastUpdated())->toBeNull();
+
+    Component::factory()->create([
+        'enabled' => true,
+        'updated_at' => now()->subWeek(),
+    ]);
+    $incident = Incident::factory()->create([
+        'visible' => ResourceVisibilityEnum::guest,
+        'updated_at' => now()->subDay(),
+    ]);
+
+    expect((new Status)->lastUpdated())->toEqual($incident->updated_at);
+
+    $update = Update::factory()->forIncident($incident)->create([
+        'status' => null,
+        'created_at' => now()->subHour(),
+        'updated_at' => now()->subHour(),
+    ]);
+
+    expect((new Status)->lastUpdated())->toEqual($update->updated_at);
+
+    $schedule = Schedule::factory()->create([
+        'updated_at' => now()->subMinute(),
+    ]);
+
+    expect((new Status)->lastUpdated())->toEqual($schedule->updated_at);
+});
+
+it('ignores activity hidden from guests when calculating the last updated timestamp', function () {
+    $component = Component::factory()->create([
+        'enabled' => true,
+        'updated_at' => now()->subWeek(),
+    ]);
+    $hidden = Incident::factory()->create([
+        'visible' => ResourceVisibilityEnum::authenticated,
+        'updated_at' => now()->subMinute(),
+    ]);
+    Update::factory()->forIncident($hidden)->create([
+        'status' => null,
+        'created_at' => now()->subMinute(),
+        'updated_at' => now()->subMinute(),
+    ]);
+    Incident::factory()->scheduled()->create([
+        'visible' => ResourceVisibilityEnum::guest,
+        'updated_at' => now()->subMinute(),
+    ]);
+    Schedule::factory()->scheduled()->create([
+        'updated_at' => now()->subMinute(),
+    ]);
+
+    expect((new Status)->lastUpdated())->toEqual($component->updated_at);
+});
+
 it('excludes disabled components from component overview', function () {
     Component::factory()->create([
         'status' => ComponentStatusEnum::operational->value,