diff --git a/src/handlers/UploadCommandHandler.php b/src/handlers/UploadCommandHandler.php
index 77606a5..b9ee67f 100755
--- a/src/handlers/UploadCommandHandler.php
+++ b/src/handlers/UploadCommandHandler.php
@@ -45,7 +45,7 @@ public function handle(UploadCommand $command)
     protected function sourceToStream($source): StreamInterface
     {
         if (is_string($source)) {
-            $source = Psr7\try_fopen($source, 'r+');
+            $source = Psr7\Utils::tryFopen($source, 'r+');
         }
 
         return Psr7\Utils::streamFor($source);