diff --git a/src/pyhf/schema/validator.py b/src/pyhf/schema/validator.py
index 40094a734f..939ed61e45 100644
--- a/src/pyhf/schema/validator.py
+++ b/src/pyhf/schema/validator.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import numbers
 from pathlib import Path
 import jsonschema
@@ -96,6 +98,10 @@ def validate(
 
     Validator = jsonschema.Draft202012Validator
 
+    # downgrade Validator for v1.0.0
+    if version == '1.0.0':
+        Validator = jsonschema.Draft6Validator  # type: ignore[assignment]
+
     if allow_tensors:
         type_checker = Validator.TYPE_CHECKER.redefine(
             "array", _is_array_or_tensor