diff --git a/Block/Listpost.php b/Block/Listpost.php
index 5dbbb2ea..7eddfe2f 100644
--- a/Block/Listpost.php
+++ b/Block/Listpost.php
@@ -22,17 +22,19 @@
 namespace Mageplaza\Blog\Block;
 
 use Exception;
+use Magento\Framework\DataObject\IdentityInterface;
 use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\Phrase;
 use Magento\Theme\Block\Html\Pager;
 use Mageplaza\Blog\Model\Config\Source\DisplayType;
+use Mageplaza\Blog\Model\Post;
 use Mageplaza\Blog\Model\ResourceModel\Post\Collection;
 
 /**
  * Class Listpost
  * @package Mageplaza\Blog\Block\Post
  */
-class Listpost extends Frontend
+class Listpost extends Frontend implements IdentityInterface
 {
     /**
      * @return Collection
@@ -209,4 +211,11 @@ public function getBlogTitle($meta = false)
 
         return $pageTitle;
     }
+
+    public function getIdentities()
+    {
+        return [
+            Post::CACHE_TAG
+        ];
+    }
 }
diff --git a/Model/Post.php b/Model/Post.php
index 10f483bc..a3161347 100755
--- a/Model/Post.php
+++ b/Model/Post.php
@@ -23,6 +23,7 @@
 
 use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory as ProductCollectionFactory;
 use Magento\Framework\Data\Collection\AbstractDb;
+use Magento\Framework\DataObject\IdentityInterface;
 use Magento\Framework\Exception\LocalizedException;
 use Magento\Framework\Model\AbstractModel;
 use Magento\Framework\Model\Context;
@@ -94,7 +95,7 @@
  * @method array getTopicsIds()
  * @method Post setTopicsIds(array $topicIds)
  */
-class Post extends AbstractModel
+class Post extends AbstractModel implements IdentityInterface
 {
     /**
      * Cache tag
@@ -319,7 +320,10 @@ public function getUrl($store = null)
      */
     public function getIdentities()
     {
-        return [self::CACHE_TAG . '_' . $this->getId()];
+        return [
+            self::CACHE_TAG,
+            self::CACHE_TAG . '_' . $this->getId()
+        ];
     }
 
     /**