diff --git a/README.md b/README.md
index 20ed94c..00b1d7e 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@
 
 ---
 
-> Working with **Contao 4.9** and up to **Contao 4.12** (PHP ^7.4 and PHP 8)
+> Working with **Contao 4.9** and up to **Contao 4.13** (PHP ^7.4 and PHP 8)
 
 ---
 
diff --git a/src/Resources/contao/dca/tl_recommendation.php b/src/Resources/contao/dca/tl_recommendation.php
index 2fc3cb8..03290bb 100644
--- a/src/Resources/contao/dca/tl_recommendation.php
+++ b/src/Resources/contao/dca/tl_recommendation.php
@@ -167,7 +167,7 @@
             (
                 array('tl_recommendation', 'generateAlias')
             ),
-            'sql'                     => "varchar(128) COLLATE utf8_bin NOT NULL default ''"
+            'sql'                     => "varchar(255) BINARY NOT NULL default ''"
         ),
         'author' => array
         (
diff --git a/src/Resources/contao/modules/ModuleRecommendation.php b/src/Resources/contao/modules/ModuleRecommendation.php
index e391a1b..d55781a 100644
--- a/src/Resources/contao/modules/ModuleRecommendation.php
+++ b/src/Resources/contao/modules/ModuleRecommendation.php
@@ -133,7 +133,7 @@ protected function parseRecommendation($objRecommendation, $objRecommendationArc
         $objTemplate->location = $arrMeta['location'] ?? null;
 
         // Add styles
-        $color = unserialize(Config::get('recommendationActiveColor'))[0];
+        $color = unserialize(Config::get('recommendationActiveColor'))[0] ?? null;
         $objTemplate->styles = $color ? ' style="color:#'.$color.'"' : '';
 
         $objTemplate->addExternalImage = false;
diff --git a/src/Resources/contao/modules/ModuleRecommendationForm.php b/src/Resources/contao/modules/ModuleRecommendationForm.php
index 9348cc1..4957d83 100644
--- a/src/Resources/contao/modules/ModuleRecommendationForm.php
+++ b/src/Resources/contao/modules/ModuleRecommendationForm.php
@@ -21,7 +21,6 @@
 use Contao\StringUtil;
 use Contao\System;
 use Contao\Widget;
-use Patchwork\Utf8;
 use Psr\Log\LogLevel;
 
 /**
@@ -63,7 +62,7 @@ public function generate()
         if ($request && System::getContainer()->get('contao.routing.scope_matcher')->isBackendRequest($request))
         {
             $objTemplate = new BackendTemplate('be_wildcard');
-            $objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FMD']['recommendationform'][0]) . ' ###';
+            $objTemplate->wildcard = '### ' . mb_strtoupper($GLOBALS['TL_LANG']['FMD']['recommendationform'][0], 'UTF-8') . ' ###';
             $objTemplate->title = $this->headline;
             $objTemplate->id = $this->id;
             $objTemplate->link = $this->name;
diff --git a/src/Resources/contao/modules/ModuleRecommendationList.php b/src/Resources/contao/modules/ModuleRecommendationList.php
index 582c4c9..b414791 100644
--- a/src/Resources/contao/modules/ModuleRecommendationList.php
+++ b/src/Resources/contao/modules/ModuleRecommendationList.php
@@ -17,7 +17,6 @@
 use Contao\Pagination;
 use Contao\StringUtil;
 use Contao\System;
-use Patchwork\Utf8;
 
 /**
  * Front end module "recommendation list".
@@ -49,7 +48,7 @@ public function generate()
         if ($request && System::getContainer()->get('contao.routing.scope_matcher')->isBackendRequest($request))
         {
             $objTemplate = new BackendTemplate('be_wildcard');
-            $objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FMD']['recommendationlist'][0]) . ' ###';
+            $objTemplate->wildcard = '### ' . mb_strtoupper($GLOBALS['TL_LANG']['FMD']['recommendationlist'][0], 'UTF-8') . ' ###';
             $objTemplate->title = $this->headline;
             $objTemplate->id = $this->id;
             $objTemplate->link = $this->name;
diff --git a/src/Resources/contao/modules/ModuleRecommendationReader.php b/src/Resources/contao/modules/ModuleRecommendationReader.php
index 99052a1..465d6db 100644
--- a/src/Resources/contao/modules/ModuleRecommendationReader.php
+++ b/src/Resources/contao/modules/ModuleRecommendationReader.php
@@ -16,7 +16,6 @@
 use Contao\Input;
 use Contao\StringUtil;
 use Contao\System;
-use Patchwork\Utf8;
 
 /**
  * Front end module "recommendation reader".
@@ -46,7 +45,7 @@ public function generate()
         if ($request && System::getContainer()->get('contao.routing.scope_matcher')->isBackendRequest($request))
         {
             $objTemplate = new BackendTemplate('be_wildcard');
-            $objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FMD']['recommendationreader'][0]) . ' ###';
+            $objTemplate->wildcard = '### ' . mb_strtoupper($GLOBALS['TL_LANG']['FMD']['recommendationreader'][0], 'UTF-8') . ' ###';
             $objTemplate->title = $this->headline;
             $objTemplate->id = $this->id;
             $objTemplate->link = $this->name;