diff --git a/shared/repositories/src/dto/type_checking_base_model.py b/shared/repositories/src/dto/type_checking_base_model.py
index f4fbee1..34e6dd1 100644
--- a/shared/repositories/src/dto/type_checking_base_model.py
+++ b/shared/repositories/src/dto/type_checking_base_model.py
@@ -7,6 +7,5 @@ class TypeCheckingBaseModel(BaseModel):
     """BaseModel with added type checking on input types."""
 
     model_config = ConfigDict(
-        validate_assignment=True,  # argument type checking
         frozen=True,  # ensure data immutability
     )
diff --git a/shared/repositories/tests/unit/type_checking_base_model_test.py b/shared/repositories/tests/unit/type_checking_base_model_test.py
new file mode 100644
index 0000000..fcf9f6c
--- /dev/null
+++ b/shared/repositories/tests/unit/type_checking_base_model_test.py
@@ -0,0 +1,46 @@
+"""Definition of unittests for TypeCheckingBaseModel class."""
+
+import unittest
+
+import pytest
+from pydantic import ValidationError
+
+from shared.repositories.src.dto.type_checking_base_model import TypeCheckingBaseModel
+
+
+class UUT(TypeCheckingBaseModel):
+    """Test class for TypeCheckingBaseModel."""
+
+    string_field: str
+    int_field: int
+
+
+class TestTypeCheckingBaseModel(unittest.TestCase):
+    """Test class for TypeCheckingBaseModel."""
+
+    def setUp(self):
+        """Set up the test case."""
+        self.uut = UUT
+        self.string_field = 'test'
+        self.int_field = 123
+
+    def test_type_checking_on_instantiation(self):
+        """Test type checking on instantiation."""
+        with pytest.raises(ValidationError):
+            _ = self.uut(
+                string_field=self.int_field,
+                int_field=self.string_field,
+            )
+
+    def test_attributes_frozen(self):
+        """Test that attributes cannot be updated."""
+        uut_instance = self.uut(
+            string_field=self.string_field,
+            int_field=self.int_field,
+        )
+        with pytest.raises(ValidationError):
+            uut_instance.string_field = self.int_field
+
+
+if __name__ == '__main__':
+    pytest.main(['-s', '-v', __file__])