diff --git a/printful.php b/printful.php
index 22b327e..1a43ea2 100644
--- a/printful.php
+++ b/printful.php
@@ -74,7 +74,7 @@ public function __construct()
     {
         $this->name = 'printful';
         $this->tab = 'others';
-        $this->version = '1.0.3';
+        $this->version = '1.0.4';
         $this->author = 'Printful';
         $this->need_instance = 1;
 
diff --git a/src/services/VersionValidatorService.php b/src/services/VersionValidatorService.php
index eaab565..217fc06 100644
--- a/src/services/VersionValidatorService.php
+++ b/src/services/VersionValidatorService.php
@@ -58,7 +58,7 @@ public function getActualVersionData()
             ));
 
             $releaseJsonData = Tools::file_get_contents(self::PLUGIN_RELEASE_DATA_URL, false, $context);
-            $releaseData = Tools::jsonDecode($releaseJsonData, true);
+            $releaseData = json_decode($releaseJsonData, true);
 
             // new result with defaults
             $currentCheckData = new PrintfulPluginVersionCheckData();
@@ -83,7 +83,7 @@ public function getActualVersionData()
      */
     protected function storeVersionCheckData(PrintfulPluginVersionCheckData $data)
     {
-        $jsonData = Tools::jsonEncode($data->toArray());
+        $jsonData = json_encode($data->toArray());
 
         Configuration::set(Printful::CONFIG_PRINTFUL_VERSION_CHECK_DATA, $jsonData);
     }