diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index f54a093..9b6dd25 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -1974,20 +1974,20 @@ def _nomina(doc, data, values, version_cfdi):
     if not node is None:
         data['comprobante'].update(CaseInsensitiveDict(node.attrib.copy()))
         info['percepciones'] = []
-        for p in node.getchildren():
+        for p in list(node):
             info['percepciones'].append(CaseInsensitiveDict(p.attrib.copy()))
 
     node = node_nomina.find('{}Deducciones'.format(PRE['NOMINA'][version]))
     if not node is None:
         data['comprobante'].update(CaseInsensitiveDict(node.attrib.copy()))
         info['deducciones'] = []
-        for d in node.getchildren():
+        for d in list(node):
             info['deducciones'].append(CaseInsensitiveDict(d.attrib.copy()))
 
     node = node_nomina.find('{}OtrosPagos'.format(PRE['NOMINA'][version]))
     if not node is None:
         info['otrospagos'] = []
-        for o in node.getchildren():
+        for o in list(node):
             info['otrospagos'].append(CaseInsensitiveDict(o.attrib.copy()))
             n = o.find('{}SubsidioAlEmpleo'.format(PRE['NOMINA'][version]))
             if not n is None:
@@ -1996,7 +1996,7 @@ def _nomina(doc, data, values, version_cfdi):
     node = node_nomina.find('{}Incapacidades'.format(PRE['NOMINA'][version]))
     if not node is None:
         info['incapacidades'] = []
-        for i in node.getchildren():
+        for i in list(node):
             info['incapacidades'].append(CaseInsensitiveDict(i.attrib.copy()))
 
     return info
@@ -3015,7 +3015,7 @@ class ImportCFDI(object):
     def _conceptos(self):
         data = []
         conceptos = self._doc.find('{}Conceptos'.format(self._pre))
-        for c in conceptos.getchildren():
+        for c in list(conceptos):
             values = CaseInsensitiveDict(c.attrib.copy())
             data.append(values)
         return data