diff --git a/composer.json b/composer.json
index 820847a..0662dcc 100644
--- a/composer.json
+++ b/composer.json
@@ -10,9 +10,9 @@
         }
     ],
     "require": {
-        "php": ">=5.4.0",
-        "symfony/http-foundation": ">=2.6 <5.0",
-        "symfony/process": ">=2.6 <5.0"
+        "php": "^7.2.5",
+        "symfony/http-foundation": "^5.0",
+        "symfony/process": "^5.0"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/PdfGenerator.php b/src/PdfGenerator.php
index fcd1471..4147147 100644
--- a/src/PdfGenerator.php
+++ b/src/PdfGenerator.php
@@ -132,7 +132,7 @@ protected function generatePdf($view)
             implode(' ', $this->commandLineArguments),
         ]);
 
-        $process = new Process($command, __DIR__);
+        $process = Process::fromShellCommandline($command, __DIR__);
         $process->setTimeout($this->timeout);
         $process->run();