diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9910ab1..21f3ca5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+v 1.45.4 [24-Ene-2022]
+----------------------
+    - Error: Cambio de NameSpace del XML de cancelación
+
+
 v 1.45.3 [23-Ene-2022]
 ----------------------
     - Error: El enviar por correo CFDI de pago. Ticket #40
diff --git a/VERSION b/VERSION
index 1a5c268..bdcb000 100644
--- a/VERSION
+++ b/VERSION
@@ -1,2 +1,2 @@
-1.45.3
+1.45.4
 
diff --git a/source/app/settings.py b/source/app/settings.py
index eecb97a..786143f 100644
--- a/source/app/settings.py
+++ b/source/app/settings.py
@@ -42,7 +42,7 @@ except ImportError:
 
 
 DEBUG = DEBUG
-VERSION = '1.45.3'
+VERSION = '1.45.4'
 EMAIL_SUPPORT = ('soporte@empresalibre.mx',)
 TITLE_APP = '{} v{}'.format(TITLE_APP, VERSION)
 
@@ -256,7 +256,8 @@ DEFAULT_GLOBAL = {
     'clave_sat': '01010101',
 }
 
-TEMPLATE_CANCEL = """<Cancelacion xmlns="http://cancelacfd.sat.gob.mx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" RfcEmisor="{rfc}" Fecha="{fecha}">
+TEMPLATE_CANCEL = """<CancelaCFD xmlns="http://cancelacfd.sat.gob.mx">
+<Cancelacion xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" RfcEmisor="{rfc}" Fecha="{fecha}">
   <Folios>
     <Folio UUID="{uuid}" Motivo="{motivo}"{folio}/>
   </Folios>
@@ -289,5 +290,7 @@ TEMPLATE_CANCEL = """<Cancelacion xmlns="http://cancelacfd.sat.gob.mx" xmlns:xsd
       </KeyValue>
     </KeyInfo>
   </Signature>
-</Cancelacion>"""
+</Cancelacion>
+</CancelaCFD>"""
+
 # ~ TEMPLATE_CANCEL = """<Cancelacion xmlns="http://cancelacfd.sat.gob.mx" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" RfcEmisor="{rfc}" Fecha="{fecha}"><Folios><Folio UUID="{uuid}" Motivo="{motivo}"{folio}/></Folios><Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315" /><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" /><Reference URI=""><Transforms><Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" /></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" /><DigestValue/></Reference></SignedInfo><SignatureValue/><KeyInfo><X509Data><X509IssuerSerial><X509IssuerName/><X509SerialNumber/></X509IssuerSerial><X509Certificate/></X509Data><KeyValue><RSAKeyValue><Modulus/><Exponent/></RSAKeyValue></KeyValue></KeyInfo></Signature></Cancelacion>"""