diff --git a/doc/source/api.rst b/doc/source/api.rst
index 3feec74..e8f8d99 100644
--- a/doc/source/api.rst
+++ b/doc/source/api.rst
@@ -23,5 +23,4 @@ API Documentation
     blue_cwl.recipes
     blue_cwl.statistics
     blue_cwl.density_manipulation
-    blue_cwl.model
     blue_cwl.variant
diff --git a/src/blue_cwl/core/common.py b/src/blue_cwl/core/common.py
index a6848a1..f4f8b42 100644
--- a/src/blue_cwl/core/common.py
+++ b/src/blue_cwl/core/common.py
@@ -33,6 +33,10 @@ def to_dict(self, **kwargs) -> dict:
         return self.model_dump(**kwargs)
 
     def to_string(self, **kwargs) -> str:
+        """Serialize the object to JSON."""
+        return self.to_json(**kwargs)
+
+    def to_json(self, **kwargs) -> str:
         """Serialize the object to JSON."""
         return self.model_dump_json(**kwargs)
 
diff --git a/src/blue_cwl/mmodel/schemas.py b/src/blue_cwl/mmodel/schemas.py
index 62f2d0f..1ae7558 100644
--- a/src/blue_cwl/mmodel/schemas.py
+++ b/src/blue_cwl/mmodel/schemas.py
@@ -7,12 +7,12 @@
 from enum import Enum
 from pathlib import Path
 
+from blue_cwl.core.common import CustomBaseModel
 from blue_cwl.mmodel.config import split_config
 from blue_cwl.mmodel.staging import (
     materialize_canonical_config,
     materialize_placeholders_config,
 )
-from blue_cwl.model import CustomBaseModel
 from blue_cwl.nexus import get_distribution_as_dict
 from blue_cwl.staging import get_entry_id
 
diff --git a/src/blue_cwl/model.py b/src/blue_cwl/model.py
deleted file mode 100644
index f512d05..0000000
--- a/src/blue_cwl/model.py
+++ /dev/null
@@ -1,32 +0,0 @@
-# SPDX-License-Identifier: Apache-2.0
-
-"""Custom Base Model for pydantic classes."""
-
-import pydantic
-
-_PYDANTIC_MAJOR = int(pydantic.__version__.split(".", maxsplit=1)[0])
-
-
-class CustomBaseModel(pydantic.BaseModel):
-    """Custom Model Config."""
-
-    class Config:
-        """Custom Model Config."""
-
-        frozen = True
-        extra = pydantic.Extra.forbid
-        validate_assignment = True
-        arbitrary_types_allowed = True
-
-    @classmethod
-    def from_dict(cls, obj):
-        """Convert object to model instance."""
-        return cls.model_validate(obj) if _PYDANTIC_MAJOR > 1 else cls.parse_obj(obj)
-
-    def to_dict(self) -> dict:
-        """Convert the object into a dict."""
-        return self.model_dump() if _PYDANTIC_MAJOR > 1 else self.dict()
-
-    def to_json(self) -> str:
-        """Serialize the object to JSON."""
-        return self.model_dump_json() if _PYDANTIC_MAJOR > 1 else self.json()
diff --git a/src/blue_cwl/utils.py b/src/blue_cwl/utils.py
index 58f3aa4..4ab1ac8 100644
--- a/src/blue_cwl/utils.py
+++ b/src/blue_cwl/utils.py
@@ -31,8 +31,8 @@
 
 from blue_cwl.constants import DEFAULT_CIRCUIT_BUILD_PARAMETERS
 from blue_cwl.core import cwl
+from blue_cwl.core.common import CustomBaseModel
 from blue_cwl.exceptions import CWLWorkflowError
-from blue_cwl.model import CustomBaseModel
 from blue_cwl.typing import StrOrPath
 
 if TYPE_CHECKING: