diff --git a/src/a2a/_base.py b/src/a2a/_base.py
index 6c50734c..76912c3f 100644
--- a/src/a2a/_base.py
+++ b/src/a2a/_base.py
@@ -1,3 +1,5 @@
+from typing import Any
+
 from pydantic import BaseModel, ConfigDict
 from pydantic.alias_generators import to_camel
 
@@ -31,8 +33,16 @@ class A2ABaseModel(BaseModel):
 
     model_config = ConfigDict(
         # SEE: https://docs.pydantic.dev/latest/api/config/#pydantic.config.ConfigDict.populate_by_name
-        validate_by_name=True,
-        validate_by_alias=True,
-        serialize_by_alias=True,
+        populate_by_name=True,
         alias_generator=to_camel_custom,
     )
+
+    def model_dump(
+        self,
+        **kwargs
+    ) -> dict[str, Any]:
+
+        if 'by_alias' not in kwargs:
+            kwargs['by_alias'] = True
+
+        return super().model_dump(**kwargs)