diff --git a/poetry.lock b/poetry.lock
index d3bd3a7..fbabf38 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -31,6 +31,24 @@ doc = ["Sphinx (>=7)", "packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphin
 test = ["anyio[trio]", "coverage[toml] (>=7)", "exceptiongroup (>=1.2.0)", "hypothesis (>=4.0)", "psutil (>=5.9)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (>=0.17)"]
 trio = ["trio (>=0.23)"]
 
+[[package]]
+name = "beartype"
+version = "0.19.0"
+description = "Unbearably fast near-real-time hybrid runtime-static type-checking in pure Python."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "beartype-0.19.0-py3-none-any.whl", hash = "sha256:33b2694eda0daf052eb2aff623ed9a8a586703bbf0a90bbc475a83bbf427f699"},
+    {file = "beartype-0.19.0.tar.gz", hash = "sha256:de42dfc1ba5c3710fde6c3002e3bd2cad236ed4d2aabe876345ab0b4234a6573"},
+]
+
+[package.extras]
+dev = ["autoapi (>=0.9.0)", "coverage (>=5.5)", "equinox", "jax[cpu]", "jaxtyping", "mypy (>=0.800)", "numba", "numpy", "pandera", "pydata-sphinx-theme (<=0.7.2)", "pygments", "pyright (>=1.1.370)", "pytest (>=4.0.0)", "sphinx", "sphinx (>=4.2.0,<6.0.0)", "sphinxext-opengraph (>=0.7.5)", "tox (>=3.20.1)", "typing-extensions (>=3.10.0.0)"]
+doc-rtd = ["autoapi (>=0.9.0)", "pydata-sphinx-theme (<=0.7.2)", "sphinx (>=4.2.0,<6.0.0)", "sphinxext-opengraph (>=0.7.5)"]
+test = ["coverage (>=5.5)", "equinox", "jax[cpu]", "jaxtyping", "mypy (>=0.800)", "numba", "numpy", "pandera", "pygments", "pyright (>=1.1.370)", "pytest (>=4.0.0)", "sphinx", "tox (>=3.20.1)", "typing-extensions (>=3.10.0.0)"]
+test-tox = ["equinox", "jax[cpu]", "jaxtyping", "mypy (>=0.800)", "numba", "numpy", "pandera", "pygments", "pyright (>=1.1.370)", "pytest (>=4.0.0)", "sphinx", "typing-extensions (>=3.10.0.0)"]
+test-tox-coverage = ["coverage (>=5.5)"]
+
 [[package]]
 name = "certifi"
 version = "2024.7.4"
@@ -1246,4 +1264,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "4e42db8b57c13c2a19b9920a69d9d853bb73bd0c7d34fcf6fb9fbfacc93c5d1d"
+content-hash = "492a4ae1580df06e9b092f869173903f0bf78e88af367f80bce35ea59782e329"
diff --git a/pyproject.toml b/pyproject.toml
index ee5a8e4..022b9c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ sparqlwrapper = "^2.0.0"
 pydantic = "^2.9.2"
 
 
+beartype = "^0.19.0"
 [tool.poetry.group.dev.dependencies]
 ruff = "^0.7.0"
 deptry = "^0.20.0"
diff --git a/rdfproxy/__init__.py b/rdfproxy/__init__.py
index caaad1e..27a2f4a 100644
--- a/rdfproxy/__init__.py
+++ b/rdfproxy/__init__.py
@@ -1,4 +1,8 @@
-from rdfproxy.adapter import SPARQLModelAdapter  # noqa: F401
-from rdfproxy.mapper import ModelBindingsMapper  # noqa: F401
-from rdfproxy.utils._types import SPARQLBinding  # noqa: F401
-from rdfproxy.utils.models import Page  # noqa: F401
+from beartype.claw import beartype_this_package
+
+beartype_this_package()
+
+from rdfproxy.adapter import SPARQLModelAdapter  # noqa: F401, E402
+from rdfproxy.mapper import ModelBindingsMapper  # noqa: F401, E402
+from rdfproxy.utils._types import SPARQLBinding  # noqa: F401, E402
+from rdfproxy.utils.models import Page  # noqa: F401, E402
diff --git a/rdfproxy/utils/_types.py b/rdfproxy/utils/_types.py
index 93b59d1..0e076b2 100644
--- a/rdfproxy/utils/_types.py
+++ b/rdfproxy/utils/_types.py
@@ -9,6 +9,7 @@
 _TModelInstance = TypeVar("_TModelInstance", bound=BaseModel)
 
 
+@runtime_checkable
 class ItemsQueryConstructor(Protocol):
     def __call__(self, query: str, limit: int, offset: int) -> str: ...
 
diff --git a/rdfproxy/utils/utils.py b/rdfproxy/utils/utils.py
index 0615d7d..ae15a12 100644
--- a/rdfproxy/utils/utils.py
+++ b/rdfproxy/utils/utils.py
@@ -9,20 +9,25 @@
     MissingModelConfigException,
     UnboundGroupingKeyException,
 )
-from rdfproxy.utils._types import ModelBoolPredicate, SPARQLBinding, _TModelBoolValue
+from rdfproxy.utils._types import (
+    ModelBoolPredicate,
+    SPARQLBinding,
+    _TModelBoolValue,
+    _TModelInstance,
+)
 
 
-def _is_type(obj: type | None, _type: type) -> bool:
+def _is_type(obj: Any, _type: type) -> bool:
     """Check if an obj is type _type or a GenericAlias with origin _type."""
     return (obj is _type) or (get_origin(obj) is _type)
 
 
-def _is_list_type(obj: type | None) -> bool:
+def _is_list_type(obj: Any) -> bool:
     """Check if obj is a list type."""
     return _is_type(obj, list)
 
 
-def _is_list_basemodel_type(obj: type | None) -> bool:
+def _is_list_basemodel_type(obj: Any) -> bool:
     """Check if a type is list[pydantic.BaseModel]."""
     return (get_origin(obj) is list) and all(
         issubclass(cls, BaseModel) for cls in get_args(obj)
@@ -104,7 +109,7 @@ def _get_model_bool_predicate_from_config_value(
             )
 
 
-def get_model_bool_predicate(model: BaseModel) -> ModelBoolPredicate:
+def get_model_bool_predicate(model: type[_TModelInstance]) -> ModelBoolPredicate:
     """Get the applicable model_bool predicate function given a model."""
     if (model_bool_value := model.model_config.get("model_bool", None)) is None:
         model_bool_predicate = default_model_bool_predicate
diff --git a/tests/unit/test_sad_path_get_bindings_from_query_result.py b/tests/unit/test_sad_path_get_bindings_from_query_result.py
index 2bc655c..fc61756 100644
--- a/tests/unit/test_sad_path_get_bindings_from_query_result.py
+++ b/tests/unit/test_sad_path_get_bindings_from_query_result.py
@@ -4,11 +4,14 @@
 
 import pytest
 
+from SPARQLWrapper.Wrapper import QueryResult
 from rdfproxy.utils.sparql_utils import get_bindings_from_query_result
 
 
 def test_basic_sad_path_get_bindings_from_query_result():
     with mock.patch("SPARQLWrapper.QueryResult") as mock_query_result:
+        mock_query_result.__class__ = QueryResult
+
         mock_query_result.return_value.requestedFormat = "xml"
         exception_message = (
             "Only QueryResult objects with JSON format are currently supported."