diff --git a/src/Plugins/Snapshot.php b/src/Plugins/Snapshot.php
index 3f9cb850..262eadcc 100644
--- a/src/Plugins/Snapshot.php
+++ b/src/Plugins/Snapshot.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Pest\Plugins;
 
+use Pest\Exceptions\InvalidOption;
 use Pest\Contracts\Plugins\HandlesArguments;
 use Pest\TestSuite;
 
@@ -23,6 +24,10 @@ final class Snapshot implements HandlesArguments
             return $arguments;
         }
 
+        if ($this->hasArgument('--parallel', $arguments)) {
+            throw new InvalidOption('The [--update-snapshots] option is not supported when running in parallel.');
+        }
+
         TestSuite::getInstance()->snapshots->flush();
 
         return $this->popArgument('--update-snapshots', $arguments);