diff --git a/pkg/checkout/checkout-grain.go b/pkg/checkout/checkout-grain.go
index 2e1f40d..0b61ef6 100644
--- a/pkg/checkout/checkout-grain.go
+++ b/pkg/checkout/checkout-grain.go
@@ -85,7 +85,7 @@ type CheckoutGrain struct {
 	lastGiftcardId    uint32
 	lastAccess        time.Time
 	lastChange        time.Time
-	Version           uint32
+	Version           uint32              `json:"version"`
 	Id                CheckoutId          `json:"id"`
 	CartId            cart.CartId         `json:"cartId"`
 	CartVersion       uint64              `json:"cartVersion"`