diff --git a/pydantic_schemas/schema_base_model.py b/pydantic_schemas/schema_base_model.py
index 06c7548..90d8df9 100644
--- a/pydantic_schemas/schema_base_model.py
+++ b/pydantic_schemas/schema_base_model.py
@@ -3,7 +3,7 @@
 
 class SchemaBaseModel(BaseModel):
     model_config = ConfigDict(
-        validate_assignment=True, protected_namespaces=(), use_enum_values=True
+        validate_assignment=True, protected_namespaces=(), use_enum_values=True, extra="forbid"
     )  # if a subclass has a model_config then this will be overridden
 
     def __setitem__(self, key, value):
diff --git a/pyproject.toml b/pyproject.toml
index 64285f9..0ba3153 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "metadataschemas"
-version = "0.1.13"
+version = "0.1.15"
 description = ""
 authors = ["Mehmood Asghar <masghar@worldbank.org>", "Gordon Blackadder <gblackadder@worldbank.org>"]
 readme = "README.md"