diff --git a/core/lib/Drupal/Core/Menu/Plugin/Block/LocalTasksBlock.php b/core/lib/Drupal/Core/Menu/Plugin/Block/LocalTasksBlock.php
index 529fe5ca1d..b6d640c448 100644
--- a/core/lib/Drupal/Core/Menu/Plugin/Block/LocalTasksBlock.php
+++ b/core/lib/Drupal/Core/Menu/Plugin/Block/LocalTasksBlock.php
@@ -85,6 +85,7 @@ public function defaultConfiguration() {
   public function build() {
     $config = $this->configuration;
     $cacheability = new CacheableMetadata();
+    $cacheability->addCacheTags(['local_task']);
     $tabs = [
       '#theme' => 'menu_local_tasks',
     ];
diff --git a/core/modules/page_cache/tests/src/Functional/PageCacheTagsIntegrationTest.php b/core/modules/page_cache/tests/src/Functional/PageCacheTagsIntegrationTest.php
index 5f84a3478d..eb1c344fff 100644
--- a/core/modules/page_cache/tests/src/Functional/PageCacheTagsIntegrationTest.php
+++ b/core/modules/page_cache/tests/src/Functional/PageCacheTagsIntegrationTest.php
@@ -83,6 +83,7 @@ public function testPageCacheTags() {
       'http_response',
       'rendered',
       'block_view',
+      'local_task',
       'config:block_list',
       'config:block.block.bartik_branding',
       'config:block.block.bartik_breadcrumbs',
@@ -124,6 +125,7 @@ public function testPageCacheTags() {
       'http_response',
       'rendered',
       'block_view',
+      'local_task',
       'config:block_list',
       'config:block.block.bartik_branding',
       'config:block.block.bartik_breadcrumbs',
diff --git a/core/modules/tracker/tests/src/Functional/TrackerTest.php b/core/modules/tracker/tests/src/Functional/TrackerTest.php
index 1a77d95ac8..5f24df29cd 100644
--- a/core/modules/tracker/tests/src/Functional/TrackerTest.php
+++ b/core/modules/tracker/tests/src/Functional/TrackerTest.php
@@ -93,6 +93,7 @@ public function testTrackerAll() {
     $expected_tags = Cache::mergeTags($expected_tags, $role_tags);
     $block_tags = [
       'block_view',
+      'local_task',
       'config:block.block.page_actions_block',
       'config:block.block.page_tabs_block',
       'config:block_list',
@@ -179,6 +180,7 @@ public function testTrackerUser() {
     $expected_tags = Cache::mergeTags($expected_tags, $role_tags);
     $block_tags = [
       'block_view',
+      'local_task',
       'config:block.block.page_actions_block',
       'config:block.block.page_tabs_block',
       'config:block_list',