diff --git a/src/gt4sd/algorithms/tests/test_registry.py b/src/gt4sd/algorithms/tests/test_registry.py
index 123a51241..23a961a89 100644
--- a/src/gt4sd/algorithms/tests/test_registry.py
+++ b/src/gt4sd/algorithms/tests/test_registry.py
@@ -59,17 +59,19 @@ def test_list_available_local_via_S3SyncError(mock_wrong_s3_env):
 def test_inherited_validation():
     Config = next(iter(ApplicationsRegistry.applications.values())).configuration_class
     with pytest.raises(
-        ValidationError, match="algorithm_version\n +none is not an allowed value"
+        ValidationError, match="should be a valid string"
     ):
         Config(algorithm_version=None)  # type: ignore
 
-    # NOTE: values convertible to string will not raise!
-    Config(algorithm_version=5)  # type: ignore
+    with pytest.raises(
+        ValidationError, match="should be a valid string"
+    ):
+        Config(algorithm_version=5)  # type: ignore
 
 
 def test_validation():
     with pytest.raises(
-        ValidationError, match="batch_size\n +value is not a valid integer"
+        ValidationError, match="should be a valid integer"
     ):
         ApplicationsRegistry.get_configuration_instance(
             algorithm_type="conditional_generation",
@@ -80,25 +82,6 @@ def test_validation():
         )
 
 
-def test_pickable_wrapped_configurations():
-    # https://github.com/samuelcolvin/pydantic/issues/2111
-    Config = next(iter(ApplicationsRegistry.applications.values())).configuration_class
-    restored_obj = assert_pickable(Config(algorithm_version="test"))
-
-    # wrong type assignment, but we did not configure it to raise here:
-    restored_obj.algorithm_version = object
-    # ensure the restored dataclass is still a pydantic dataclass (mimic validation)
-    _, optional_errors = restored_obj.__pydantic_model__.__fields__.get(
-        "algorithm_version"
-    ).validate(
-        restored_obj.algorithm_version,
-        restored_obj.__dict__,
-        loc="algorithm_version",
-        cls=restored_obj.__class__,
-    )
-    assert optional_errors is not None
-
-
 def test_multiple_registration():
     class OtherAlgorithm(GeneratorAlgorithm):
         pass