diff --git a/pyproject.toml b/pyproject.toml
index 627636c..54a5468 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "retrack"
-version = "1.0.0-alpha.1"
+version = "1.0.0-alpha.2"
 description = "A business rules engine"
 authors = ["Gabriel Guarisa <gabrielguarisa@gmail.com>", "Nathalia Trotte <nathaliatrotte@gmail.com>"]
 license = "MIT"
diff --git a/retrack/engine/request_manager.py b/retrack/engine/request_manager.py
index a4b484f..7facb7f 100644
--- a/retrack/engine/request_manager.py
+++ b/retrack/engine/request_manager.py
@@ -71,7 +71,7 @@ def __create_model(
         fields = {}
         for input_field in self.inputs:
             fields[input_field.data.name] = (
-                str,
+                typing.Annotated[str, pydantic.BeforeValidator(str)],
                 pydantic.Field(
                     default=Ellipsis
                     if input_field.data.default is None
diff --git a/tests/test_engine/test_request_manager.py b/tests/test_engine/test_request_manager.py
index 34c4413..3d30ac3 100644
--- a/tests/test_engine/test_request_manager.py
+++ b/tests/test_engine/test_request_manager.py
@@ -48,3 +48,10 @@ def test_validate_payload_with_valid_payload(valid_input_dict_before_validation)
     assert isinstance(payload, pydantic.BaseModel)
     result = rm.validate(pd.DataFrame([{"example": "test"}]))
     assert isinstance(result, pd.DataFrame)
+
+
+def test_validate_dict_with_model(valid_input_dict_before_validation):
+    rm = RequestManager([Input(**valid_input_dict_before_validation)])
+
+    assert issubclass(rm.model, pydantic.BaseModel)
+    assert rm.model.model_validate({"example": 1111}) == rm.model(example="1111")