diff --git a/api.py b/api.py
index 9e9ee71..844a530 100644
--- a/api.py
+++ b/api.py
@@ -1,23 +1,15 @@
 # This file is part of the carrier_send_shipments_seurvalencia module for Tryton.
 # The COPYRIGHT file at the top level of this repository contains the full
 # copyright notices and license terms.
+import logging
 from trytond.pool import PoolMeta
 from trytond.pyson import Eval, Not, Equal
-import logging
-
-try:
-    from seurvalencia.picking import *
-except ImportError:
-    logger = logging.getLogger(__name__)
-    message = 'Install Seur: pip install seurvalencia'
-    logger.error(message)
-    raise Exception(message)
+from seurvalencia.picking import *
 
 __all__ = ['CarrierApi']
 
 
-class CarrierApi:
-    __metaclass__ = PoolMeta
+class CarrierApi(metaclass=PoolMeta):
     __name__ = 'carrier.api'
 
     @classmethod
diff --git a/manifest.py b/manifest.py
index 6b351df..f953354 100644
--- a/manifest.py
+++ b/manifest.py
@@ -9,8 +9,7 @@ from base64 import decodestring
 __all__ = ['CarrierManifest']
 
 
-class CarrierManifest:
-    __metaclass__ = PoolMeta
+class CarrierManifest(metaclass=PoolMeta):
     __name__ = 'carrier.manifest'
 
     def get_manifest_seurvalencia(self, api, from_date, to_date):
diff --git a/setup.py b/setup.py
index 12f4e3f..4306730 100644
--- a/setup.py
+++ b/setup.py
@@ -7,10 +7,7 @@ from setuptools import setup
 import re
 import os
 import io
-try:
-    from configparser import ConfigParser
-except ImportError:
-    from ConfigParser import ConfigParser
+from configparser import ConfigParser
 
 MODULE2PREFIX = {}
 
diff --git a/shipment.py b/shipment.py
index 8e639f8..e8f878f 100644
--- a/shipment.py
+++ b/shipment.py
@@ -13,8 +13,7 @@ __all__ = ['ShipmentOut']
 logger = logging.getLogger(__name__)
 
 
-class ShipmentOut:
-    __metaclass__ = PoolMeta
+class ShipmentOut(metaclass=PoolMeta):
     __name__ = 'stock.shipment.out'
 
     @classmethod