diff --git a/Dockerfile b/Dockerfile
index 7894872..36f18b1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,34 +7,40 @@ RUN apt install software-properties-common -y \
     && add-apt-repository ppa:deadsnakes/ppa
 
 RUN apt-get install -y --no-install-recommends \
-  python3.9 python3.9-distutils python3.9-dev \
   python3.10 python3.10-distutils python3.10-dev \
   python3.11 python3.11-distutils python3.11-dev \
   python3.12 python3-setuptools python3.12-dev \
+  python3.13 python3-setuptools python3.13-dev \
   wget \
   ca-certificates
 
 RUN wget https://bootstrap.pypa.io/get-pip.py \
-  && python3.9 get-pip.py pip==23.2.1 --break-system-packages \
   && python3.10 get-pip.py pip==23.2.1 --break-system-packages \
   && python3.11 get-pip.py pip==23.2.1 --break-system-packages \
   && python3.12 get-pip.py pip==23.2.1  --break-system-packages \
+  && python3.13 get-pip.py pip==23.2.1  --break-system-packages \
   && rm get-pip.py
 
 RUN apt-get install -y --no-install-recommends \
-        libxml2-dev \
-        libxmlsec1-dev \
-        build-essential \
+	gcc \
+	build-essential \
+    	pkg-config \
+    	libxml2-dev \
+    	libxmlsec1-dev \
+    	xmlsec1 \
+   	libxml2-dev \
+    	libxslt-dev \
         zip
 
-RUN python3.9 --version
 RUN python3.10 --version
 RUN python3.11 --version
 RUN python3.12 --version
+RUN python3.13 --version
+
 
-RUN pip3.9 install setuptools setuptools-rust
 RUN pip3.10 install setuptools setuptools-rust
 RUN pip3.11 install setuptools setuptools-rust --break-system-packages
 RUN pip3.12 install setuptools setuptools-rust --break-system-packages
+RUN pip3.13 install setuptools setuptools-rust --break-system-packages
 
 RUN pip3 install tox pytest --break-system-packages
diff --git a/Makefile.dev b/Makefile.dev
index ae90ab9..03e6a40 100644
--- a/Makefile.dev
+++ b/Makefile.dev
@@ -15,7 +15,7 @@ dev-shell:
 	docker run --rm -ti -v "$(PWD):/app" -w /app --name facho-cli facho bash
 
 test:
-	docker run -t -v $(PWD):/app -w /app facho sh -c 'cd /app; python3.12 setup.py test'
+	docker run -t -v $(PWD):/app -w /app facho sh -c 'cd /app; python3.13 -m pytest'
 
 tox:
 	docker run -it -v $(PWD)/:/app -w /app facho tox
diff --git a/facho/facho.py b/facho/facho.py
index 0970c2c..19dc8e6 100644
--- a/facho/facho.py
+++ b/facho/facho.py
@@ -140,12 +140,12 @@ class LXMLBuilder:
         attrs['pretty_print'] = attrs.pop('pretty_print', False)
         attrs['encoding'] = attrs.pop('encoding', 'UTF-8')
 
-        for el in elem.getiterator():
+        for el in elem.iter():
             keys = filter(lambda key: key.startswith('facho_'), el.keys())
             self.remove_attributes(el, keys, exclude=['facho_optional'])
 
             is_optional = el.get('facho_optional', 'False') == 'True'
-            if is_optional and el.getchildren() == [] and el.keys() == [
+            if is_optional and list(el) == [] and el.keys() == [
                     'facho_optional']:
                 el.getparent().remove(el)
 
@@ -291,7 +291,7 @@ class FachoXML:
         # se fuerza la adicion como un nuevo elemento
         if append:
             last_slibing = None
-            for child in parent.getchildren():
+            for child in list(parent):
                 if child.tag == node_tag:
                     last_slibing = child
 
diff --git a/facho/fe/client/dian.py b/facho/fe/client/dian.py
index 3da2cbf..fdd3611 100644
--- a/facho/fe/client/dian.py
+++ b/facho/fe/client/dian.py
@@ -8,7 +8,7 @@ import xmlsec
 import urllib.request
 from datetime import datetime
 from dataclasses import dataclass, asdict, field
-from typing import List
+
 import http.client
 import hashlib
 import secrets
@@ -47,7 +47,7 @@ class GetNumberingRangeResponse:
         ValidateDateTo: str
         TechnicalKey: str
 
-    NumberRangeResponse: List[NumberRangeResponse]
+    NumberRangeResponse: list[NumberRangeResponse]
 
 
     @classmethod
@@ -91,7 +91,7 @@ class SendBillAsync(SOAPService):
 @dataclass
 class SendTestSetAsyncResponse:
     ZipKey: str
-    ErrorMessageList: List[str]
+    ErrorMessageList: list[str]
 
     @classmethod
     def fromdict(cls, data):
@@ -134,7 +134,7 @@ class GetStatusResponse:
     IsValid: bool
     StatusDescription: str
     StatusCode: int
-    ErrorMessage: List[str]
+    ErrorMessage: list[str]
 
     @classmethod
     def fromdict(cls, data):
diff --git a/facho/fe/client/wsse/signature.py b/facho/fe/client/wsse/signature.py
index cc42a3d..6d69adc 100644
--- a/facho/fe/client/wsse/signature.py
+++ b/facho/fe/client/wsse/signature.py
@@ -9,7 +9,7 @@ module.
 
 """
 import pytz
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from lxml import etree
 from lxml.etree import QName
 
@@ -222,7 +222,7 @@ def sign_envelope(
     return _sign_envelope_with_key(envelope, key, signature_method, digest_method)
 
 def get_timestamp(timestamp = None, delta=None):
-    timestamp = timestamp or datetime.utcnow()
+    timestamp = timestamp or datetime.now(timezone.utc)
     if delta:
         timestamp += delta
 
diff --git a/facho/fe/data/dian/codelist/__init__.py b/facho/fe/data/dian/codelist/__init__.py
index 837009d..4c8d9bf 100644
--- a/facho/fe/data/dian/codelist/__init__.py
+++ b/facho/fe/data/dian/codelist/__init__.py
@@ -35,8 +35,8 @@ class CodeList:
         row = {}
 
         #construir registro...
-        for value in xmlrow.getchildren():
-            row[value.attrib['ColumnRef']] = value.getchildren()[0].text
+        for value in list(xmlrow):
+            row[value.attrib['ColumnRef']] = list(value)[0].text
 
         return row
 
diff --git a/facho/fe/fe.py b/facho/fe/fe.py
index a703606..1c6163e 100644
--- a/facho/fe/fe.py
+++ b/facho/fe/fe.py
@@ -5,7 +5,6 @@ import uuid
 import xmlsig
 import xades
 from datetime import datetime
-import OpenSSL
 import zipfile
 # import warnings
 import hashlib
@@ -18,6 +17,21 @@ from dateutil import tz
 
 from cryptography.hazmat.primitives.serialization import pkcs12
 
+# Monkey-patch xades/xmlsig para compatibilidad con pyOpenSSL >= 24
+# (PKCS12 fue eliminado de OpenSSL.crypto, pero ambas librerías lo referencian)
+import OpenSSL
+import xades.xades_context
+
+if not hasattr(OpenSSL.crypto, 'PKCS12'):
+    def _patched_load_pkcs12(self, key):
+        if isinstance(key, tuple):
+            self.x509 = key[1]
+            self.public_key = key[1].public_key()
+            self.private_key = key[0]
+        else:
+            raise NotImplementedError("unsupported key type")
+    xades.xades_context.XAdESContext.load_pkcs12 = _patched_load_pkcs12
+
 AMBIENTE_PRUEBAS = codelist.TipoAmbiente.by_name('Pruebas')['code']
 AMBIENTE_PRODUCCION = codelist.TipoAmbiente.by_name('Producción')['code']
 
@@ -444,9 +458,6 @@ class DianXMLExtensionSigner:
             self._pkcs12_data,
             self._passphrase))
 
-        # ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(
-        #     self._pkcs12_data,
-        #     self._passphrase))
         if self._localpolicy:
             with mock_xades_policy():
                 ctx.sign(signature)
@@ -590,8 +601,8 @@ class DianXMLExtensionSignerVerifier:
         if isinstance(self._pkcs12_path_or_bytes, str):
             pkcs12_data = open(self._pkcs12_path_or_bytes, 'rb').read()
         ctx = xades.XAdESContext()
-        ctx.load_pkcs12(OpenSSL.crypto.load_pkcs12(pkcs12_data,
-                                                   self._passphrase))
+        ctx.load_pkcs12(pkcs12.load_key_and_certificates(
+            pkcs12_data, self._passphrase))
         try:
             if self._localpolicy:
                 with mock_xades_policy():
diff --git a/facho/fe/form/__init__.py b/facho/fe/form/__init__.py
index 026eef8..267b8f8 100644
--- a/facho/fe/form/__init__.py
+++ b/facho/fe/form/__init__.py
@@ -11,7 +11,6 @@ from datetime import datetime, date
 # from collections import defaultdict
 import decimal
 from decimal import Decimal
-import typing
 from ..data.dian import codelist
 
 DECIMAL_PRECISION = 6
@@ -60,7 +59,7 @@ class AmountCollection(Collection):
 
 class Amount:
     def __init__(
-            self, amount: typing.Union[int, float, str, "Amount"],
+            self, amount: int | float | str | "Amount",
             currency: Currency = Currency('COP')):
 
         # DIAN 1.7.-2020: 1.2.3.1
@@ -294,7 +293,7 @@ class TaxScheme:
 class Party:
     name: str
     ident: str
-    responsability_code: typing.List[Responsability]
+    responsability_code: list[Responsability]
     responsability_regime_code: str
     organization_code: str
     tax_scheme: TaxScheme = field(default_factory=lambda: TaxScheme('01'))
@@ -327,7 +326,7 @@ class TaxScheme:
 @dataclass
 class TaxSubTotal:
     percent: float
-    scheme: typing.Optional[TaxScheme] = None
+    scheme: TaxScheme | None = None
     tax_amount: Amount = field(default_factory=lambda: Amount(0.0))
 
     def calculate(self, invline):
@@ -359,7 +358,7 @@ class TaxTotalOmit(TaxTotal):
 @dataclass
 class WithholdingTaxSubTotal:
     percent: float
-    scheme: typing.Optional[TaxScheme] = None
+    scheme: TaxScheme | None = None
     tax_amount: Amount = field(default_factory=lambda: Amount(0.0))
 
     def calculate(self, invline):
@@ -491,7 +490,7 @@ class AllowanceCharge:
     reason: AllowanceChargeReason = None
 
     # Valor Base para calcular el descuento o el cargo
-    base_amount: typing.Optional[Amount] = field(
+    base_amount: Amount | None = field(
         default_factory=lambda: Amount(0.0))
 
     # Porcentaje: Porcentaje que aplicar.
@@ -536,9 +535,9 @@ class InvoiceLine:
     # ya que al reportar los totales es sobre
     # la factura y el percent es unico por type_code
     # de subtotal
-    tax: typing.Optional[TaxTotal]
-    withholding: typing.Optional[WithholdingTaxTotal]
-    allowance_charge: typing.List[AllowanceCharge] = dataclasses.field(
+    tax: TaxTotal | None
+    withholding: WithholdingTaxTotal | None
+    allowance_charge: list[AllowanceCharge] = dataclasses.field(
         default_factory=list)
 
     def add_allowance_charge(self, charge):
diff --git a/facho/fe/nomina/__init__.py b/facho/fe/nomina/__init__.py
index a1f523a..bb66ad0 100644
--- a/facho/fe/nomina/__init__.py
+++ b/facho/fe/nomina/__init__.py
@@ -8,7 +8,7 @@
 from dataclasses import dataclass
 from datetime import datetime
 import hashlib
-import typing
+
 
 from .. import fe
 from .. import form
@@ -86,13 +86,13 @@ class NumeroSecuencia:
 
 @dataclass
 class Periodo:
-    fecha_ingreso: typing.Union[str, Fecha]
-    fecha_liquidacion_inicio: typing.Union[str, Fecha]
-    fecha_liquidacion_fin: typing.Union[str, Fecha]
-    fecha_generacion: typing.Union[str, Fecha]
+    fecha_ingreso: str | Fecha
+    fecha_liquidacion_inicio: str | Fecha
+    fecha_liquidacion_fin: str | Fecha
+    fecha_generacion: str | Fecha
 
     tiempo_laborado: int = 1
-    fecha_retiro: typing.Union[str, Fecha] = None
+    fecha_retiro: str | Fecha | None = None
 
     def __post_init__(self):
         self.fecha_ingreso = Fecha.cast(self.fecha_ingreso)
@@ -259,7 +259,7 @@ class InformacionGeneral:
         def __str__(self):
             self.valor
 
-    fecha_generacion: typing.Union[str, Fecha]
+    fecha_generacion: str | Fecha
     hora_generacion: str
     periodo_nomina: PeriodoNomina
     tipo_moneda: TipoMoneda
diff --git a/facho/fe/nomina/devengado/horas_extras.py b/facho/fe/nomina/devengado/horas_extras.py
index de21772..c591781 100644
--- a/facho/fe/nomina/devengado/horas_extras.py
+++ b/facho/fe/nomina/devengado/horas_extras.py
@@ -1,5 +1,5 @@
 from dataclasses import dataclass
-from typing import List
+
 
 from ..amount import Amount
 from .devengado import Devengado
@@ -30,7 +30,7 @@ class DevengadoHoraExtra:
 
 @dataclass
 class DevengadoHorasExtrasDiarias(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HEDs')
@@ -39,7 +39,7 @@ class DevengadoHorasExtrasDiarias(Devengado):
 
 @dataclass
 class DevengadoHorasExtrasNocturnas(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HENs')
@@ -49,7 +49,7 @@ class DevengadoHorasExtrasNocturnas(Devengado):
 
 @dataclass
 class DevengadoHorasRecargoNocturno(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HRNs')
@@ -58,7 +58,7 @@ class DevengadoHorasRecargoNocturno(Devengado):
 
 @dataclass
 class DevengadoHorasExtrasDiariasDominicalesYFestivos(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HEDDFs')
@@ -67,7 +67,7 @@ class DevengadoHorasExtrasDiariasDominicalesYFestivos(Devengado):
 
 @dataclass
 class DevengadoHorasRecargoDiariasDominicalesYFestivos(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HRDDFs')
@@ -76,7 +76,7 @@ class DevengadoHorasRecargoDiariasDominicalesYFestivos(Devengado):
 
 @dataclass
 class DevengadoHorasExtrasNocturnasDominicalesYFestivos(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HENDFs')
@@ -85,7 +85,7 @@ class DevengadoHorasExtrasNocturnasDominicalesYFestivos(Devengado):
 
 @dataclass
 class DevengadoHorasRecargoNocturnoDominicalesYFestivos(Devengado):
-    horas_extras: List[DevengadoHoraExtra]
+    horas_extras: list[DevengadoHoraExtra]
     
     def apply(self, fragment):
         hora_extra_xml = fragment.fragment('./HRNDFs')
diff --git a/requirements_dev.txt b/requirements_dev.txt
index e96da27..47ca138 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,17 +1,15 @@
-attrs==22.1.0
-distlib==0.3.6
-filelock==3.8.0
-iniconfig==1.1.1
-packaging==21.3
-platformdirs==2.5.2
-pluggy==1.0.0
-py==1.11.0
-pyparsing==3.0.9
-pytest==7.1.3
+attrs==24.2.0
+distlib==0.3.9
+filelock==3.16.1
+iniconfig==2.0.0
+packaging==24.1
+platformdirs==4.3.6
+pluggy==1.5.0
+pyparsing==3.2.0
+pytest==8.3.4
 semantic-version==2.10.0
-setuptools-rust==1.5.2
+setuptools-rust==1.10.2
 six==1.16.0
-tomli==2.0.1
-tox==3.26.0
-typing_extensions==4.4.0
-virtualenv==20.16.5
+tomli==2.2.1
+tox==4.23.2
+virtualenv==20.28.0
diff --git a/setup.py b/setup.py
index 226c7f8..b355046 100644
--- a/setup.py
+++ b/setup.py
@@ -14,14 +14,14 @@ with open('HISTORY.rst') as history_file:
     history = history_file.read()
 
 requirements = ['Click>=8.1.7',
-                'zeep==4.2.1',
-                'lxml==5.2.2',
-                'cryptography==3.3.2',
-                'pyOpenSSL==20.0.1',
-                'xmlsig==0.1.7',
-                'xades==1.0.0',
-                'xmlsec==1.3.14',
-                'python-dateutil==2.9.0.post0',
+                'zeep>=4.2.1',
+                'lxml>=5.2.2',
+                'cryptography>=41.0.0',
+                'pyOpenSSL>=23.2.0',
+                'xmlsig>=0.1.9',
+                'xades>=1.0.0',
+                'xmlsec>=1.3.12',
+                'python-dateutil>=2.9.0',
                 # usamos esta dependencia en runtime
                 # para forzar uso de policy_id de archivo local
                 'mock>=5.1.0',
@@ -57,10 +57,10 @@ setup(
         'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
         'Natural Language :: English',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
     ],
     description="Facturacion Electronica Colombia",
     entry_points={
diff --git a/tox.ini b/tox.ini
index f06bea6..89f9089 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py39, py310, py311, py312, flake8
+envlist = py39, py310, py311, py312, py313, flake8
 
 [travis]
 python =
@@ -7,6 +7,7 @@ python =
     3.10: py310
     3.11: py311
     3.12: py312
+    3.13: py313
 
 [testenv:flake8]
 basepython = python