diff --git a/connexion/spec.py b/connexion/spec.py
index 5b0a1a2..02acfd5 100644
--- a/connexion/spec.py
+++ b/connexion/spec.py
@@ -47,7 +47,7 @@ def create_spec_validator(spec: dict) -> Draft4Validator:
         if not valid:
             return
         if isinstance(instance, dict) and 'default' in instance:
-            for error in instance_validator.iter_errors(instance['default'], instance):
+            for error in instance_validator.evolve(schema=instance).iter_errors(instance['default']):
                 yield error
 
     SpecValidator = extend_validator(Draft4Validator, {"properties": validate_defaults})
diff --git a/setup.py b/setup.py
index 2b5b067..0ebf999 100755
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ version = read_version('connexion')
 
 install_requires = [
     'clickclick>=1.2,<21',
-    'jsonschema>=2.5.1,<5',
+    'jsonschema>=4.0.1,<5',
     'PyYAML>=5.1,<7',
     'requests>=2.27,<3',
     'inflection>=0.3.1,<0.6',