diff --git a/cuenca_validations/types/requests.py b/cuenca_validations/types/requests.py
index 6066238e..57231fcc 100644
--- a/cuenca_validations/types/requests.py
+++ b/cuenca_validations/types/requests.py
@@ -139,6 +139,15 @@ class CardActivationRequest(BaseModel):
     cvv2: str = Field(
         ..., strip_whitespace=True, min_length=3, max_length=3, regex=r'\d{3}'
     )
+    card_holder_user_id: Optional[str] = None
+
+    def to_dict(self):
+        return dict(
+            number=self.number,
+            exp_month=self.exp_month,
+            exp_year=self.exp_year,
+            cvv2=self.cvv2,
+        )
 
 
 class ApiKeyUpdateRequest(BaseRequest):
diff --git a/cuenca_validations/version.py b/cuenca_validations/version.py
index fd42bf7b..4adde76a 100644
--- a/cuenca_validations/version.py
+++ b/cuenca_validations/version.py
@@ -1 +1 @@
-__version__ = '0.11.17'
+__version__ = '0.11.18'