diff --git a/superfaktura/invoice.py b/superfaktura/invoice.py
index 34fa038..a2b2d91 100644
--- a/superfaktura/invoice.py
+++ b/superfaktura/invoice.py
@@ -6,7 +6,7 @@ from superfaktura.bank_account import BankAccount
 from superfaktura.client_contacts import ClientContactModel
 from superfaktura.enumerations.currency import Currencies
 from superfaktura.superfaktura_api import SuperFakturaAPI
-from utils.data_types import Date, DateEncoder
+from superfaktura.utils.data_types import Date, DateEncoder
 
 
 @dataclass
diff --git a/utils/__init__.py b/superfaktura/utils/__init__.py
similarity index 100%
rename from utils/__init__.py
rename to superfaktura/utils/__init__.py
diff --git a/utils/country.py b/superfaktura/utils/country.py
similarity index 100%
rename from utils/country.py
rename to superfaktura/utils/country.py
diff --git a/utils/data_types.py b/superfaktura/utils/data_types.py
similarity index 100%
rename from utils/data_types.py
rename to superfaktura/utils/data_types.py