diff --git a/setup.py b/setup.py
index 0a47d62..42d4072 100644
--- a/setup.py
+++ b/setup.py
@@ -4,7 +4,7 @@
 from setuptools import setup
 import re
 import os
-import ConfigParser
+import configparser
 
 MODULE = 'stock_lot_jreport'
 PREFIX = 'nantic'
@@ -14,7 +14,7 @@ MODULE2PREFIX = {}
 def read(fname):
     return open(os.path.join(os.path.dirname(__file__), fname)).read()
 
-config = ConfigParser.ConfigParser()
+config = configparser.ConfigParser()
 config.readfp(open('tryton.cfg'))
 info = dict(config.items('tryton'))
 for key in ('depends', 'extras_depend', 'xml'):
diff --git a/stock.py b/stock.py
index 2049f06..8b7d3e4 100644
--- a/stock.py
+++ b/stock.py
@@ -10,8 +10,7 @@ from dateutil.relativedelta import relativedelta
 __all__ = ['Lot', 'LotReport']
 
 
-class Lot:
-    __metaclass__ = PoolMeta
+class Lot(metaclass=PoolMeta):
     __name__ = 'stock.lot'
 
     lag_quantity = fields.Function(fields.Float('Lag Quantity'),