diff --git a/public/modules/custom/helfi_annif/src/KeywordManager.php b/public/modules/custom/helfi_annif/src/KeywordManager.php
index 08d91e3f7..35bfd8129 100644
--- a/public/modules/custom/helfi_annif/src/KeywordManager.php
+++ b/public/modules/custom/helfi_annif/src/KeywordManager.php
@@ -4,6 +4,7 @@
 
 namespace Drupal\helfi_annif;
 
+use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
@@ -44,6 +45,8 @@ final class KeywordManager {
    *   The keyword generator.
    * @param \Drupal\Core\Queue\QueueFactory $queueFactory
    *   The queue factory.
+   * @param \Drupal\Core\Cache\CacheTagsInvalidatorInterface $cacheTagsInvalidator
+   *   The cache validator.
    *
    * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
    * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
@@ -52,6 +55,7 @@ public function __construct(
     private readonly EntityTypeManagerInterface $entityTypeManager,
     private readonly KeywordClient $keywordGenerator,
     private readonly QueueFactory $queueFactory,
+    private readonly CacheTagsInvalidatorInterface $cacheTagsInvalidator,
   ) {
     $this->termStorage = $this->entityTypeManager->getStorage('taxonomy_term');
   }
@@ -268,6 +272,7 @@ private function saveKeywords(EntityInterface $entity, array $keywords) : void {
     // processedItems is set for update hooks.
     $this->processedItems[$this->getEntityKey($entity)] = TRUE;
 
+    $this->invalidateCacheTags($terms);
     $entity->save();
   }
 
@@ -315,4 +320,19 @@ private function getTerm(Keyword $keyword, string $langcode) {
     return $term;
   }
 
+  /**
+   * Invalidate Annif-keyword terms' cache tags.
+   *
+   * @param array $terms
+   *   Array of terms to process.
+   */
+  private function invalidateCacheTags(array $terms): void {
+    $cacheTags = array_map(
+      fn ($term) => $term->getCacheTags(),
+      $terms
+    );
+
+    $this->cacheTagsInvalidator->invalidateTags(array_merge(...$cacheTags));
+  }
+
 }
diff --git a/public/modules/custom/helfi_annif/src/Plugin/Block/RecommendationsBlock.php b/public/modules/custom/helfi_annif/src/Plugin/Block/RecommendationsBlock.php
index 1ba6a66ac..ee1ec8660 100644
--- a/public/modules/custom/helfi_annif/src/Plugin/Block/RecommendationsBlock.php
+++ b/public/modules/custom/helfi_annif/src/Plugin/Block/RecommendationsBlock.php
@@ -94,7 +94,11 @@ public function getCacheContexts(): array {
    * {@inheritdoc}
    */
   public function getCacheTags(): array {
-    return Cache::mergeTags(parent::getCacheTags(), $this->getContextValue('node')->getCacheTags());
+    return Cache::mergeTags(
+      parent::getCacheTags(),
+      $this->getContextValue('node')->getCacheTags(),
+      $this->getAnnifKeywordCacheTags()
+    );
   }
 
   /**
@@ -115,4 +119,25 @@ private function handleNoRecommendations(array $response): array {
     return $response;
   }
 
+  /**
+   * Get list of cache tags for the block.
+   *
+   * @return array
+   *   Array of cache tags for Annif-keywords related to this node.
+   */
+  private function getAnnifKeywordCacheTags(): array {
+    $entity = $this->getContextValue('node');
+    if (!$entity->hasField('field_annif_keywords') || $entity->get('field_annif_keywords')->isEmpty()) {
+      return [];
+    }
+
+    $cacheTags = array_map(
+      fn ($term) => $term->getCacheTags(),
+      $entity->get('field_annif_keywords')->referencedEntities()
+    );
+
+    // Flatten array by merging the destructed arrays.
+    return array_merge(...$cacheTags);
+  }
+
 }
diff --git a/public/modules/custom/helfi_annif/tests/src/Kernel/KeywordManagerTest.php b/public/modules/custom/helfi_annif/tests/src/Kernel/KeywordManagerTest.php
index 17204fc88..4dc41198b 100644
--- a/public/modules/custom/helfi_annif/tests/src/Kernel/KeywordManagerTest.php
+++ b/public/modules/custom/helfi_annif/tests/src/Kernel/KeywordManagerTest.php
@@ -25,6 +25,7 @@ class KeywordManagerTest extends KernelTestBase {
 
   use AnnifApiTestTrait;
 
+
   /**
    * {@inheritdoc}
    */
@@ -133,10 +134,13 @@ private function getSut(
       ->get(Argument::any())
       ->willReturn($queue);
 
+    $cacheInvalidator = $this->container->get('cache_tags.invalidator');
+
     return new KeywordManager(
       $entityTypeManager,
       $client,
-      $queueFactory->reveal()
+      $queueFactory->reveal(),
+      $cacheInvalidator
     );
   }
 
diff --git a/public/modules/custom/helfi_annif/tests/src/Unit/KeywordManagerTest.php b/public/modules/custom/helfi_annif/tests/src/Unit/KeywordManagerTest.php
index 12c1b56b8..89973ac22 100644
--- a/public/modules/custom/helfi_annif/tests/src/Unit/KeywordManagerTest.php
+++ b/public/modules/custom/helfi_annif/tests/src/Unit/KeywordManagerTest.php
@@ -4,6 +4,7 @@
 
 namespace Drupal\Tests\helfi_annif\Unit\TextConverter;
 
+use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
 use Drupal\Core\Entity\EntityStorageInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Queue\QueueFactory;
@@ -128,10 +129,15 @@ private function getSut(
       ->get(Argument::any())
       ->willReturn($queue);
 
+    $cacheInvalidator = $this->prophesize(CacheTagsInvalidatorInterface::class);
+    $cacheInvalidator
+      ->invalidateTags(['taxonomy_term:1234']);
+
     return new KeywordManager(
       $entityTypeManager->reveal(),
       $client,
-      $queueFactory->reveal()
+      $queueFactory->reveal(),
+      $cacheInvalidator->reveal(),
     );
   }