diff --git a/schema/eval.schema.json b/schema/eval.schema.json
index 7246f81..0c89dbf 100644
--- a/schema/eval.schema.json
+++ b/schema/eval.schema.json
@@ -13,6 +13,7 @@
         "model_info",
         "evaluation_results"
     ],
+    "additionalProperties": false,
     "properties": {
         "schema_version": {
             "type": "string",
@@ -264,7 +265,6 @@
                         }
                     },
                     "score_details": {
-                        "type": "string",
                         "description": "The score for the evaluation and related details",
                         "required": [
                             "score"
diff --git a/schema/eval_types.py b/schema/eval_types.py
index 5b6870f..7216a23 100644
--- a/schema/eval_types.py
+++ b/schema/eval_types.py
@@ -1,13 +1,13 @@
 # generated by datamodel-codegen:
 #   filename:  eval.schema.json
-#   timestamp: 2025-11-18T23:38:04+00:00
+#   timestamp: 2025-11-26T17:25:26+00:00
 
 from __future__ import annotations
 
 from enum import Enum
 from typing import Any, Dict, List, Optional, Union
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, ConfigDict, Field
 
 
 class SourceData(BaseModel):
@@ -168,6 +168,9 @@ class DetailedEvaluationResultsPerSample(BaseModel):
 
 
 class EvaluationLog(BaseModel):
+    model_config = ConfigDict(
+        extra='forbid',
+    )
     schema_version: str = Field(
         ..., description='Version of the schema used for this evaluation data'
     )