diff --git a/kedro/framework/hooks/specs.py b/kedro/framework/hooks/specs.py
index c80e9625ec..996134920e 100644
--- a/kedro/framework/hooks/specs.py
+++ b/kedro/framework/hooks/specs.py
@@ -63,7 +63,7 @@ def before_node_run(
 
         Args:
             node: The ``Node`` to run.
-            catalog: A ``BaseDataCatalog`` containing the node's inputs and outputs.
+            catalog: A catalog containing the node's inputs and outputs.
             inputs: The dictionary of inputs dataset.
                 The keys are dataset names and the values are the actual loaded input data,
                 not the dataset instance.
@@ -93,7 +93,7 @@ def after_node_run(  # noqa: PLR0913
 
         Args:
             node: The ``Node`` that ran.
-            catalog: A ``BaseDataCatalog`` containing the node's inputs and outputs.
+            catalog: A catalog containing the node's inputs and outputs.
             inputs: The dictionary of inputs dataset.
                 The keys are dataset names and the values are the actual loaded input data,
                 not the dataset instance.
@@ -122,7 +122,7 @@ def on_node_error(  # noqa: PLR0913
         Args:
             error: The uncaught exception thrown during the node run.
             node: The ``Node`` to run.
-            catalog: A ``BaseDataCatalog`` containing the node's inputs and outputs.
+            catalog: A catalog containing the node's inputs and outputs.
             inputs: The dictionary of inputs dataset.
                 The keys are dataset names and the values are the actual loaded input data,
                 not the dataset instance.
@@ -164,7 +164,7 @@ def before_pipeline_run(
                    }
 
             pipeline: The ``Pipeline`` that will be run.
-            catalog: The ``BaseDataCatalog`` to be used during the run.
+            catalog: The catalog to be used during the run.
         """
         pass
 
@@ -202,7 +202,7 @@ def after_pipeline_run(
 
             run_result: The output of ``Pipeline`` run.
             pipeline: The ``Pipeline`` that was run.
-            catalog: The ``BaseDataCatalog`` used during the run.
+            catalog: The catalog used during the run.
         """
         pass
 
@@ -242,7 +242,7 @@ def on_pipeline_error(
                    }
 
             pipeline: The ``Pipeline`` that will was run.
-            catalog: The ``BaseDataCatalog`` used during the run.
+            catalog: The catalog used during the run.
         """
         pass
 
diff --git a/kedro/framework/project/__init__.py b/kedro/framework/project/__init__.py
index 094cfd4aef..195fa077f6 100644
--- a/kedro/framework/project/__init__.py
+++ b/kedro/framework/project/__init__.py
@@ -52,15 +52,6 @@ def validate(
         default_class = self.default(settings, self)
         for name in self.names:
             setting_value = getattr(settings, name)
-            # Allow using new KedroDataCatalog
-            # TODO: remove with the old catalog
-            if (
-                f"{setting_value.__module__}.{setting_value.__qualname__}"
-                == "kedro.io.kedro_data_catalog.KedroDataCatalog"
-                and f"{default_class.__module__}.{default_class.__qualname__}"
-                == "kedro.io.data_catalog.DataCatalog"
-            ):
-                continue
             if not issubclass(setting_value, default_class):
                 raise ValidationError(
                     f"Invalid value '{setting_value.__module__}.{setting_value.__qualname__}' "
diff --git a/kedro/io/__init__.py b/kedro/io/__init__.py
index 17abb93e9e..9697e1bd35 100644
--- a/kedro/io/__init__.py
+++ b/kedro/io/__init__.py
@@ -16,14 +16,13 @@
     Version,
 )
 from .data_catalog import DataCatalog
-from .kedro_data_catalog import BaseDataCatalog, KedroDataCatalog
+from .kedro_data_catalog import KedroDataCatalog
 from .lambda_dataset import LambdaDataset
 from .memory_dataset import MemoryDataset
 from .shared_memory_dataset import SharedMemoryDataset
 
 __all__ = [
     "AbstractDataset",
-    "BaseDataCatalog",
     "AbstractVersionedDataset",
     "CachedDataset",
     "CatalogProtocol",
diff --git a/kedro/io/kedro_data_catalog.py b/kedro/io/kedro_data_catalog.py
index cba1b8a28f..c63d557d66 100644
--- a/kedro/io/kedro_data_catalog.py
+++ b/kedro/io/kedro_data_catalog.py
@@ -11,9 +11,8 @@
 import difflib
 import logging
 import re
-from typing import Any, Union
+from typing import Any
 
-from kedro.io import DataCatalog
 from kedro.io.catalog_config_resolver import CatalogConfigResolver, Patterns
 from kedro.io.core import (
     AbstractDataset,
@@ -333,6 +332,3 @@ def exists(self, name: str) -> bool:
         except DatasetNotFoundError:
             return False
         return dataset.exists()
-
-
-BaseDataCatalog = Union[DataCatalog, KedroDataCatalog]