diff --git a/_install.php b/_install.php
index e666ded..902260b 100644
--- a/_install.php
+++ b/_install.php
@@ -68,8 +68,8 @@ try {
     $s->put('keep_empty_feed', false, 'boolean', 'Keep active empty feeds', false, true);
     $s->put('tag_case', 0, 'integer', 'How to transform imported tags', false, true);
     $s->put('user', '', 'string', 'User id that has right on post', false, true);
-    $s->put('post_full_tpl', serialize(['post', 'category', 'tag', 'archive']), 'string', 'List of templates types for full feed', false, true);
-    $s->put('post_title_redir', serialize(['feed']), 'string', 'List of templates types for redirection to original post', false, true);
+    $s->put('post_full_tpl', json_encode(['post', 'category', 'tag', 'archive']), 'string', 'List of templates types for full feed', false, true);
+    $s->put('post_title_redir', json_encode(['feed']), 'string', 'List of templates types for redirection to original post', false, true);
 
     return true;
 } catch (Exception $e) {
diff --git a/inc/class.zcfsrsextposts.php b/inc/class.zcfsrsextposts.php
index 9b30c1d..3b34626 100644
--- a/inc/class.zcfsrsextposts.php
+++ b/inc/class.zcfsrsextposts.php
@@ -106,7 +106,7 @@ class zcfsRsExtPosts extends rsExtPost
     public static function getURL(dcRecord $rs): string
     {
         $url   = $rs->zcFeed('url');
-        $types = @unserialize(dcCore::app()->blog->settings->__get(basename(dirname('../' . __DIR__)))->post_title_redir);
+        $types = json_decode(dcCore::app()->blog->settings->__get(basename(dirname('../' . __DIR__)))->post_title_redir);
         $full  = is_array($types) && in_array(dcCore::app()->url->type, $types);
 
         return $url && $full ?
@@ -127,7 +127,7 @@ class zcfsRsExtPosts extends rsExtPost
         $content  = self::zcFeedBrother('getContent', [&$rs, $absolute_urls]);
 
         if ($url && $sitename && $rs->post_type == 'post') {
-            $types = @unserialize(dcCore::app()->blog->settings->__get(basename(dirname('../' . __DIR__)))->post_full_tpl);
+            $types = json_decode(dcCore::app()->blog->settings->__get(basename(dirname('../' . __DIR__)))->post_full_tpl);
 
             if (is_array($types) && in_array(dcCore::app()->url->type, $types)) {
                 return $content . sprintf(
diff --git a/inc/class.zcfsupgrade.php b/inc/class.zcfsupgrade.php
index b75e38f..a89876f 100644
--- a/inc/class.zcfsupgrade.php
+++ b/inc/class.zcfsupgrade.php
@@ -29,10 +29,10 @@ class zcfsUpgrade
     {
     }
 
-    // Rename settings
     protected static function preUpgrade20221210()
     {
-        $settings_ids = [
+        // Rename settings
+        $setting_ids = [
             'zoneclearFeedServer_active'           => 'active',
             'zoneclearFeedServer_pub_active'       => 'pub_active',
             'zoneclearFeedServer_post_status_new'  => 'psot_new_status',
@@ -45,10 +45,38 @@ class zcfsUpgrade
             'zoneclearFeedServer_post_title_redir' => 'post_title_redir',
         ];
 
-        foreach ($settings_ids as $old => $new) {
+        foreach ($setting_ids as $old => $new) {
             $cur             = dcCore::app()->con->openCursor(dcCore::app()->prefix . dcNamespace::NS_TABLE_NAME);
             $cur->setting_id = $new;
             $cur->update("WHERE setting_id = '" . $old . "' and setting_ns = 'zoneclearFeedServer' ");
         }
+
+        // use json rather than serialise
+        $setting_values = [
+            'post_full_tpl'    => ['post', 'category', 'tag', 'archive'],
+            'post_title_redir' => ['feed']
+        ];
+
+        $record = dcCore::app()->con->select(
+            'SELECT * FROM ' . dcCore::app()->prefix . dcNamespace::NS_TABLE_NAME . ' ' .
+            "WHERE setting_ns = '" . dcCore::app()->con->escape(basename(dirname('../' . __DIR__))) . "' "
+        );
+
+        while($record->fetch()) {
+            foreach($setting_values as $key => $default) {
+                try {
+                    $value = @unserialize($record->__get($key));
+                } catch(Exception) {
+                    $value = $default;
+                }
+
+                $cur                = dcCore::app()->con->openCursor(dcCore::app()->prefix . dcNamespace::NS_TABLE_NAME);
+                $cur->setting_value = json_encode(!is_array($value) ? $default : $value);
+                $cur->update(
+                    "WHERE setting_id = '" . $key . "' and setting_ns = '" . $record->setting_ns . "' " .
+                    'AND blog_id ' . (null === $record->blog_id ? 'IS NULL ' : ("= '" . dcCore::app()->con->escape($record->blog_id) . "' "))
+                );
+            }
+        }
     }
 }