diff --git a/src/RequestService.ts b/src/RequestService.ts
index 6728a70a..1ef2c5ce 100644
--- a/src/RequestService.ts
+++ b/src/RequestService.ts
@@ -52,6 +52,7 @@ class RequestService {
     this.config = {
       checkRequestStatus: true,
       ...config,
+      vin: config.vin.toUpperCase(),
     };
   }