diff --git a/README.md b/README.md
index 36eedb0..76f9f15 100644
--- a/README.md
+++ b/README.md
@@ -29,10 +29,10 @@ val InvoiceId = new HumanIdOps["inv", String]
 type CustomerId = HumanId["cus", String]
 val CustomerId = new HumanIdOps["cus", String]
 
-val invoiceId1: Either[String, InvoiceId] = InvoiceId.parseRequirePrefix("inv_1234")
-val invoiceId2: InvoiceId = InvoiceId.fromId("2345")
+val invoiceId1: Either[String, InvoiceId] = InvoiceId.parseRequirePrefix("inv_q6CQPBY4yscNnHLan9dJyhLt")
+val invoiceId2: InvoiceId = InvoiceId.fromId("H2ggLQjE3txWzIAGstc6nmmn")
 
-val customerId1: Either[String, CustomerId] = CustomerId.parseRequirePrefix("cus_1234").toOption.get
+val customerId1: Either[String, CustomerId] = CustomerId.parseRequirePrefix("cus_E366DWqKWTaCrDeDmU31Xk2C").toOption.get
 
 // val customerId2: CustomerId = invoiceId2 // ⚠️ compile error, as different prefixes mean different types
 ```