diff --git a/103705/schema/etsi_types.schema.json b/103705/schema/etsi_types.schema.json
index d14629af583e01d603a7df7863f72584832de5b7..63c3226fd9e50820b4c9d237a7ff9435948b9931 100644
--- a/103705/schema/etsi_types.schema.json
+++ b/103705/schema/etsi_types.schema.json
@@ -523,7 +523,7 @@
     },
     "IBAN": {
       "type": "string",
-      "pattern": "[A-Z]{2}[0-9]{2}[A-Z0-9]{1,30}",
+      "pattern": "[A-Z]{2}[0-9]{2}[a-zA-Z0-9]{1,30}",
       "description": "International Bank Account Number according to ISO 13616-1:2020"
     },
     "PaymentCard": {