diff --git a/setuptools/config/pyprojecttoml.py b/setuptools/config/pyprojecttoml.py
index d4024956..2c3bd6bf 100644
--- a/setuptools/config/pyprojecttoml.py
+++ b/setuptools/config/pyprojecttoml.py
@@ -27,16 +27,22 @@ def load_file(filepath: _Path) -> dict:
 
 
 def validate(config: dict, filepath: _Path) -> bool:
-    from . import _validate_pyproject as validator
+    import validate_pyproject.api, validate_pyproject.errors, validate_pyproject.cli, validate_pyproject.plugins
 
-    trove_classifier = validator.FORMAT_FUNCTIONS.get("trove-classifier")
+    trove_classifier = validate_pyproject.api.FORMAT_FUNCTIONS.get("trove-classifier")
     if hasattr(trove_classifier, "_disable_download"):
         # Improve reproducibility by default. See issue 31 for validate-pyproject.
         trove_classifier._disable_download()  # type: ignore
 
+    plugins = validate_pyproject.plugins.list_from_entry_points()
+    validator = validate_pyproject.api.Validator(
+        validate_pyproject.cli.select_plugins(plugins, ('setuptools', 'distutils'), ()),
+        validate_pyproject.api.FORMAT_FUNCTIONS,
+    )
+
     try:
-        return validator.validate(config)
-    except validator.ValidationError as ex:
+        return validator(config)
+    except validate_pyproject.errors.ValidationError as ex:
         _logger.error(f"configuration error: {ex.summary}")  # type: ignore
         _logger.debug(ex.details)  # type: ignore
         error = ValueError(f"invalid pyproject.toml config: {ex.name}")  # type: ignore