diff --git a/docs/changes.rst b/docs/changes.rst
index 034074a4..bea77aab 100644
--- a/docs/changes.rst
+++ b/docs/changes.rst
@@ -14,6 +14,8 @@ v0.4
 - :func:`.io.dump` and :func:`.io.load` now work with file like objects,
   which means you can use them with the ``with open(...) as f: dump(obj, f)``
   pattern, like you'd do with ``pickle``. :pr:`234` by `Benjamin Bossan`_.
+- All `scikit-learn` estimators are trusted by default.
+  :pr:`237` by :user:`Edoardo Abati <EdAbati>`.
 
 v0.3
 ----
diff --git a/skops/io/_general.py b/skops/io/_general.py
index 7f27fbcb..126bcfaf 100644
--- a/skops/io/_general.py
+++ b/skops/io/_general.py
@@ -8,7 +8,7 @@
 import numpy as np
 
 from ._audit import Node, get_tree
-from ._trusted_types import PRIMITIVE_TYPE_NAMES
+from ._trusted_types import PRIMITIVE_TYPE_NAMES, SKLEARN_ESTIMATOR_TYPE_NAMES
 from ._utils import (
     LoadContext,
     SaveContext,
@@ -383,7 +383,7 @@ def __init__(
 
         self.children = {"attrs": attrs}
         # TODO: what do we trust?
-        self.trusted = self._get_trusted(trusted, [])
+        self.trusted = self._get_trusted(trusted, default=SKLEARN_ESTIMATOR_TYPE_NAMES)
 
     def _construct(self):
         cls = gettype(self.module_name, self.class_name)
diff --git a/skops/io/_trusted_types.py b/skops/io/_trusted_types.py
index e3c38ffd..1ef1b826 100644
--- a/skops/io/_trusted_types.py
+++ b/skops/io/_trusted_types.py
@@ -1,3 +1,13 @@
+from sklearn.utils import all_estimators
+
+from ._utils import get_type_name
+
 PRIMITIVES_TYPES = [int, float, str, bool]
 
 PRIMITIVE_TYPE_NAMES = ["builtins." + t.__name__ for t in PRIMITIVES_TYPES]
+
+SKLEARN_ESTIMATOR_TYPE_NAMES = [
+    get_type_name(estimator_class)
+    for _, estimator_class in all_estimators()
+    if get_type_name(estimator_class).startswith("sklearn.")
+]
diff --git a/skops/io/tests/test_audit.py b/skops/io/tests/test_audit.py
index a1ae0188..71914b4d 100644
--- a/skops/io/tests/test_audit.py
+++ b/skops/io/tests/test_audit.py
@@ -162,12 +162,4 @@ def test_complex_pipeline_untrusted_set():
 
     untrusted = get_untrusted_types(data=dumps(clf))
     type_names = [x.split(".")[-1] for x in untrusted]
-    assert type_names == [
-        "sqrt",
-        "square",
-        "LogisticRegression",
-        "FeatureUnion",
-        "Pipeline",
-        "StandardScaler",
-        "FunctionTransformer",
-    ]
+    assert type_names == ["sqrt", "square"]
diff --git a/skops/io/tests/test_persist.py b/skops/io/tests/test_persist.py
index c38871c6..012ab7f7 100644
--- a/skops/io/tests/test_persist.py
+++ b/skops/io/tests/test_persist.py
@@ -56,6 +56,7 @@
 from skops.io import dump, dumps, get_untrusted_types, load, loads
 from skops.io._audit import NODE_TYPE_MAPPING, get_tree
 from skops.io._sklearn import UNSUPPORTED_TYPES
+from skops.io._trusted_types import SKLEARN_ESTIMATOR_TYPE_NAMES
 from skops.io._utils import LoadContext, SaveContext, _get_state, get_state
 from skops.io.exceptions import UnsupportedTypeException
 
@@ -468,7 +469,7 @@ def get_input(estimator):
 @pytest.mark.parametrize(
     "estimator", _tested_estimators(), ids=_get_check_estimator_ids
 )
-def test_can_persist_fitted(estimator, request):
+def test_can_persist_fitted(estimator):
     """Check that fitted estimators can be persisted and return the right results."""
     set_random_state(estimator, random_state=0)
 
@@ -491,6 +492,8 @@ def test_can_persist_fitted(estimator, request):
     loaded = loads(dumped, trusted=untrusted_types)
     assert_params_equal(estimator.__dict__, loaded.__dict__)
 
+    assert not any(type_ in SKLEARN_ESTIMATOR_TYPE_NAMES for type_ in untrusted_types)
+
     for method in [
         "predict",
         "predict_proba",