diff --git a/stree/.readthedocs.yaml b/.readthedocs.yaml
similarity index 90%
rename from stree/.readthedocs.yaml
rename to .readthedocs.yaml
index 6b44aba..811702d 100644
--- a/stree/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -4,7 +4,7 @@ sphinx:
   configuration: docs/source/conf.py
 
 python:
-  version: 3.8
+  version: 3.11
   install:
     - requirements: requirements.txt
     - requirements: docs/requirements.txt
diff --git a/stree/Strees.py b/stree/Strees.py
index e8ebdc8..d38aac3 100644
--- a/stree/Strees.py
+++ b/stree/Strees.py
@@ -174,10 +174,10 @@ class Stree(BaseEstimator, ClassifierMixin):
         """Return the version of the package."""
         return __version__
 
-    def __call__(self) -> str:
+    def __call__(self) -> None:
         """Only added to comply with scikit-learn base sestimator for ensembles
         """
-        return self.version()
+        pass
 
     def _more_tags(self) -> dict:
         """Required by sklearn to supply features of the classifier
diff --git a/stree/_version.py b/stree/_version.py
index 3e8d9f9..bf25615 100644
--- a/stree/_version.py
+++ b/stree/_version.py
@@ -1 +1 @@
-__version__ = "1.4.0"
+__version__ = "1.4.1"
diff --git a/stree/tests/Stree_test.py b/stree/tests/Stree_test.py
index df99100..621e585 100644
--- a/stree/tests/Stree_test.py
+++ b/stree/tests/Stree_test.py
@@ -728,7 +728,7 @@ class Stree_test(unittest.TestCase):
     def test_call(self) -> None:
         """Check call method."""
         clf = Stree()
-        self.assertEqual(__version__, clf())
+        self.assertIsNone(clf())
 
     def test_graph(self):
         """Check graphviz representation of the tree."""