diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3aecb8d..5fd5b75 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+v 1.40.0 [20-12-2020]
+----------------------
+    - Error: Al parsear XML en Python 3.9+
+    - Mejora: Agregar versión de Empresa Libre a plantilla.
+
+
 v 1.39.1 [17-sep-2020]
 ----------------------
     - Error: Esquema para complemento IEDU
diff --git a/README.md b/README.md
index 826f193..e9fde91 100644
--- a/README.md
+++ b/README.md
@@ -10,16 +10,17 @@ Este proyecto está en continuo desarrollo, contratar un esquema de soporte,
 nos ayuda a continuar su desarrollo. Ponte en contacto con nosotros para
 contratar: administracion ARROBA empresalibre.net
 
-#### Ahora también puede aportar con Bitcoin Cash (BCH):
+#### Ahora también puede aportar con criptomonedas:
 
-`pq763fj7kxxf2wtf360lfsy5ydw84yz72q76hanhxq`
+BCH: `qztd3l00xle5tffdqvh2snvadkuau2ml0uqm4n875d`
+BTC: `3FhiXcXmAesmQzrNEngjHFnvaJRhU1AGWV`
 
 
 ### Requerimientos:
 
 * Servidor web, recomendado Nginx
 * uwsgi
-* python3.6+
+* python3.7+
 * xsltproc
 * openssl
 * xmlsec
diff --git a/VERSION b/VERSION
index 0c11aad..32b7211 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.39.1
+1.40.0
diff --git a/requirements.txt b/requirements.txt
index d33642b..a007210 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,3 +13,9 @@ pypng
 reportlab
 psycopg2-binary
 cryptography
+
+# escpos
+# pyusb
+# pyserial
+# qrcode
+
diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index aade77a..0163de6 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -1339,9 +1339,15 @@ class LIBO(object):
         self._leyendas(data.get('leyendas', ''))
 
         self._cancelado(data['cancelada'])
+        self._others_values(data)
         self._clean()
         return
 
+    def _others_values(self, data):
+        version = data['version']
+        self._set_cell('{version}', version)
+        return
+
     def pdf(self, path, data, ods=False):
         options = {'AsTemplate': True, 'Hidden': True}
         log.debug('Abrir plantilla...')
@@ -1818,7 +1824,7 @@ def _get_relacionados(doc, version):
     if node is None:
         return ''
 
-    uuids = ['UUID: {}'.format(n.attrib['UUID']) for n in node.getchildren()]
+    uuids = ['UUID: {}'.format(n.attrib['UUID']) for n in list(node)]
     return '\n'.join(uuids)
 
 
@@ -1933,7 +1939,8 @@ def _conceptos(doc, version, options):
 
     data = []
     conceptos = doc.find('{}Conceptos'.format(PRE[version]))
-    for c in conceptos.getchildren():
+    # ~ for c in conceptos.getchildren():
+    for c in list(conceptos):
         values = CaseInsensitiveDict(c.attrib.copy())
         if is_nomina:
             values['noidentificacion'] = values['ClaveProdServ']
@@ -2002,7 +2009,8 @@ def _totales(doc, cfdi, version):
 
         node = imp.find('{}Traslados'.format(PRE[version]))
         if node is not None:
-            for n in node.getchildren():
+            # ~ for n in node.getchildren():
+            for n in list(node):
                 tmp = CaseInsensitiveDict(n.attrib.copy())
                 if version == '3.3':
                     tasa = round(float(tmp['tasaocuota']), DECIMALES)
@@ -2013,7 +2021,8 @@ def _totales(doc, cfdi, version):
 
         node = imp.find('{}Retenciones'.format(PRE[version]))
         if node is not None:
-            for n in node.getchildren():
+            # ~ for n in node.getchildren():
+            for n in list(node):
                 tmp = CaseInsensitiveDict(n.attrib.copy())
                 if version == '3.3':
                     title = 'Retención {} {}'.format(
@@ -2196,6 +2205,7 @@ def get_data_from_xml(invoice, values):
     if data['pagos']:
         data['pays'] = _cfdipays(doc, data, version)
     data['pakings'] = values.get('pakings', [])
+    data['version'] = values['version']
     return data
 
 
diff --git a/source/app/models/main.py b/source/app/models/main.py
index 464633b..e1f9c1d 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -49,6 +49,7 @@ from settings import (
     PATHS,
     URL,
     VALUES_PDF,
+    VERSION,
     RFCS,
 )
 
@@ -3965,7 +3966,7 @@ class Facturas(BaseModel):
     def _get_not_in_xml(self, invoice, emisor):
         pdf_from = Configuracion.get_('make_pdf_from') or '1'
 
-        values = {}
+        values = {'version': VERSION}
 
         values['notas'] = invoice.notas
         values['fechadof'] = str(emisor.fecha_dof)
diff --git a/source/app/settings.py b/source/app/settings.py
index 9346afe..72ced22 100644
--- a/source/app/settings.py
+++ b/source/app/settings.py
@@ -47,7 +47,7 @@ except ImportError:
 
 
 DEBUG = DEBUG
-VERSION = '1.39.1'
+VERSION = '1.40.0'
 EMAIL_SUPPORT = ('soporte@empresalibre.mx',)
 TITLE_APP = '{} v{}'.format(TITLE_APP, VERSION)
 
diff --git a/source/templates/plantilla_factura.ods b/source/templates/plantilla_factura.ods
index 0505175..d54d86d 100644
Binary files a/source/templates/plantilla_factura.ods and b/source/templates/plantilla_factura.ods differ