diff --git a/src/Enums/Transport.php b/src/Enums/Transport.php
index 3de68a9..a4dadd5 100644
--- a/src/Enums/Transport.php
+++ b/src/Enums/Transport.php
@@ -4,8 +4,8 @@
 
 namespace Prism\Relay\Enums;
 
-enum Transport
+enum Transport: string
 {
-    case Http;
-    case Stdio;
+    case Http = 'http';
+    case Stdio = 'stdio';
 }