diff --git a/facturapi/resources/customers.py b/facturapi/resources/customers.py
index 93896ec..5e93b2f 100644
--- a/facturapi/resources/customers.py
+++ b/facturapi/resources/customers.py
@@ -7,10 +7,10 @@
 import datetime as dt
 from typing import ClassVar, Optional, cast
 
-from cuenca_validations.types import SATRegimeCode
 from pydantic import BaseModel
 from pydantic.dataclasses import dataclass
 
+from ..types.enums import TaxSystemType
 from ..types.general import CustomerAddress
 from .base import Creatable, Queryable, Retrievable, Updatable
 
@@ -23,7 +23,7 @@ class CustomerRequest(BaseModel):
     Attributes:
         legal_name (str): Full name of the customer.
         tax_id (str): RFC of the customer.
-        tax_system: SATRegimeCode regime code from SAT
+        tax_system: TaxSystemType regime code from SAT
         email (str): Email of the customer.
         phone (str): Phone of the customer. Optional.
         address (CustomerAddress): Address object of the customer. Optional.
@@ -32,7 +32,7 @@ class CustomerRequest(BaseModel):
 
     legal_name: str
     tax_id: str
-    tax_system: SATRegimeCode
+    tax_system: TaxSystemType
     email: str
     phone: Optional[str]
     address: CustomerAddress
@@ -46,7 +46,7 @@ class CustomerUpdateRequest(BaseModel):
     Attributes:
         legal_name (str): Full name of the customer. Optional.
         tax_id (str): RFC of the customer. Optional.
-        tax_system: SATRegimeCode regime code from SAT
+        tax_system: TaxSystemType regime code from SAT
         email (str): Email of the customer. Optional.
         phone (str): Phone of the customer. Optional.
         address (CustomerAddress): Address object of the customer. Optional.
@@ -55,7 +55,7 @@ class CustomerUpdateRequest(BaseModel):
 
     legal_name: Optional[str]
     tax_id: Optional[str]
-    tax_system: Optional[SATRegimeCode]
+    tax_system: Optional[TaxSystemType]
     email: Optional[str]
     phone: Optional[str]
     address: Optional[CustomerAddress]
@@ -77,7 +77,7 @@ class Customer(Creatable, Queryable, Retrievable, Updatable):
         tax_id (str): RFC of the customer.
         email (str): Email of the customer.
         address (CustomerAddress): Address data of the model. Optional.
-        tax_system (SATRegimeCode): Enum from catalogue of SAT
+        tax_system (TaxSystemType): Enum from catalogue of SAT
         phone (str): Phone of the customer. Defaults to `None`.
     """
 
@@ -89,7 +89,7 @@ class Customer(Creatable, Queryable, Retrievable, Updatable):
     tax_id: str
     email: str
     address: CustomerAddress
-    tax_system: Optional[SATRegimeCode] = None
+    tax_system: Optional[TaxSystemType] = None
     phone: Optional[str] = None
 
     @classmethod
diff --git a/facturapi/types/__init__.py b/facturapi/types/__init__.py
index 0d8d271..6fa7c22 100644
--- a/facturapi/types/__init__.py
+++ b/facturapi/types/__init__.py
@@ -9,6 +9,7 @@
     'PaymentForm',
     'PaymentMethod',
     'SanitizedDict',
+    'TaxSystemType',
     'exc',
     'general',
     'validators',
@@ -22,5 +23,6 @@
     InvoiceUse,
     PaymentForm,
     PaymentMethod,
+    TaxSystemType,
 )
 from .queries import BaseQuery, DateFilter
diff --git a/facturapi/types/enums.py b/facturapi/types/enums.py
index ed99ae5..6ffb74c 100644
--- a/facturapi/types/enums.py
+++ b/facturapi/types/enums.py
@@ -94,3 +94,29 @@ class PaymentMethod(str, Enum):
 
     contado = 'PUE'
     parcialidades = 'PPD'
+
+
+class TaxSystemType(str, Enum):
+    GRL_PM = "601"  # General de Ley Personas Morales
+    PM_FN = "603"  # Personas Morales con Fines no Lucrativos
+    SAL_IS = "605"  # Sueldos y Salarios e Ingresos Asimilados a Salarios
+    ARR = "606"  # Arrendamiento
+    DEM_ING = "608"  # Demás ingresos
+    CONS = "609"  # Consolidación
+    RES_EXT = "610"  # Residentes en el Extranjero sin Establecimiento Permanente en México # noqa: E501
+    DIV = "611"  # Ingresos por Dividendos (socios y accionistas)
+    PF_AEP = "612"  # Personas Físicas con Actividades Empresariales y Profesionales # noqa: E501
+    INT = "614"  # Ingresos por intereses
+    SIN_OBL = "616"  # Sin obligaciones fiscales
+    SCP_DIF = "620"  # Sociedades Cooperativas de Producción que optan por diferir sus ingresos # noqa: E501
+    INC_FISC = "621"  # Incorporación Fiscal
+    AGRO_GAN_SILV_PES = "622"  # Actividades Agrícolas, Ganaderas, Silvícolas y Pesqueras # noqa: E501
+    OP_GRUPO_SOC = "623"  # Opcional para Grupos de Sociedades
+    COOR = "624"  # Coordinados
+    HID = "628"  # Hidrocarburos
+    ENAJ_ADQ = "607"  # Régimen de Enajenación o Adquisición de Bienes
+    PREF_EM_MULT = "629"  # De los Regímenes Fiscales Preferentes y de las Empresas Multinacionales # noqa: E501
+    ENAJ_ACC_BOL = "630"  # Enajenación de acciones en bolsa de valores
+    ING_PREM = "615"  # Régimen de los ingresos por obtención de premios
+    AE_PLAT_TEC = "625"  # Régimen de las Actividades Empresariales con ingresos a través de Plataformas Tecnológicas # noqa: E501
+    RS_CONF = "626"  # Régimen Simplificado de Confianza
diff --git a/facturapi/version.py b/facturapi/version.py
index 57098d6..a8ade31 100644
--- a/facturapi/version.py
+++ b/facturapi/version.py
@@ -1,2 +1,2 @@
-__version__ = '0.1.0'  # pragma: no cover
+__version__ = '0.1.1'  # pragma: no cover
 CLIENT_VERSION = __version__
diff --git a/requirements.txt b/requirements.txt
index 6e29fac..8cc3387 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,3 @@
 requests==2.28.1
-pydantic==1.8.2
+pydantic==1.7.3
 dataclasses>=0.7;python_version<"3.7"
-cuenca-validations==0.11.18
diff --git a/setup.py b/setup.py
index b8a0d74..57ae11b 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@
     python_requires='>=3.6',
     install_requires=[
         'requests>=2.4,<2.26',
-        'pydantic==1.8.2',
+        'pydantic==1.7.3',
         'dataclasses>=0.7;python_version<"3.7"',
     ],
     classifiers=[