diff --git a/docs/lowercase_filter.py b/docs/lowercase_filter.py
index e7b3d2f28..142ed1f35 100644
--- a/docs/lowercase_filter.py
+++ b/docs/lowercase_filter.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Implements a Lower Case Filter for Sphinx spelling """
+"""Implements a Lower Case Filter for Sphinx spelling"""
 
 from enchant import tokenize
 
diff --git a/qiskit_machine_learning/algorithms/classifiers/__init__.py b/qiskit_machine_learning/algorithms/classifiers/__init__.py
index 06fd4f890..0367c179b 100644
--- a/qiskit_machine_learning/algorithms/classifiers/__init__.py
+++ b/qiskit_machine_learning/algorithms/classifiers/__init__.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Classifiers Package """
+"""Classifiers Package"""
 
 from .neural_network_classifier import NeuralNetworkClassifier
 from .qsvc import QSVC
diff --git a/qiskit_machine_learning/algorithms/inference/__init__.py b/qiskit_machine_learning/algorithms/inference/__init__.py
index 322bb8f1c..8809d6965 100644
--- a/qiskit_machine_learning/algorithms/inference/__init__.py
+++ b/qiskit_machine_learning/algorithms/inference/__init__.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Inference Package """
+"""Inference Package"""
 
 
 from .qbayesian import QBayesian
diff --git a/qiskit_machine_learning/algorithms/regressors/__init__.py b/qiskit_machine_learning/algorithms/regressors/__init__.py
index 123556e67..3805b09a6 100644
--- a/qiskit_machine_learning/algorithms/regressors/__init__.py
+++ b/qiskit_machine_learning/algorithms/regressors/__init__.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Regressors Package"""
+"""Regressors Package"""
 
 from .qsvr import QSVR
 from .neural_network_regressor import NeuralNetworkRegressor
diff --git a/qiskit_machine_learning/algorithms/trainable_model.py b/qiskit_machine_learning/algorithms/trainable_model.py
index 3b2bace9b..75ee67711 100644
--- a/qiskit_machine_learning/algorithms/trainable_model.py
+++ b/qiskit_machine_learning/algorithms/trainable_model.py
@@ -1,6 +1,6 @@
 # This code is part of a Qiskit project.
 #
-# (C) Copyright IBM 2021, 2024.
+# (C) Copyright IBM 2021, 2025.
 #
 # This code is licensed under the Apache License, Version 2.0. You may
 # obtain a copy of this license in the LICENSE.txt file in the root directory
@@ -117,7 +117,7 @@ def optimizer(self) -> Optimizer | Minimizer:
     def optimizer(self, optimizer: Optimizer | Minimizer | None = None):
         """Sets the optimizer to use in training process."""
         if optimizer is None:
-            optimizer = SLSQP()
+            optimizer = SLSQP(maxiter=1000)
         self._optimizer = optimizer
 
     @property
diff --git a/qiskit_machine_learning/exceptions.py b/qiskit_machine_learning/exceptions.py
index ac2befee7..483b00f67 100644
--- a/qiskit_machine_learning/exceptions.py
+++ b/qiskit_machine_learning/exceptions.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Machine Learning Exception """
+"""Machine Learning Exception"""
 
 from qiskit.exceptions import QiskitError
 
diff --git a/qiskit_machine_learning/optimizers/optimizer_utils/__init__.py b/qiskit_machine_learning/optimizers/optimizer_utils/__init__.py
index 7304b2e3f..58a419370 100644
--- a/qiskit_machine_learning/optimizers/optimizer_utils/__init__.py
+++ b/qiskit_machine_learning/optimizers/optimizer_utils/__init__.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-""" Supplementary tools for optimizers. """
+"""Supplementary tools for optimizers."""
 
 from .learning_rate import LearningRate
 
diff --git a/qiskit_machine_learning/utils/loss_functions/kernel_loss_functions.py b/qiskit_machine_learning/utils/loss_functions/kernel_loss_functions.py
index e17b962dd..d1396c00e 100644
--- a/qiskit_machine_learning/utils/loss_functions/kernel_loss_functions.py
+++ b/qiskit_machine_learning/utils/loss_functions/kernel_loss_functions.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Kernel Loss utilities """
+"""Kernel Loss utilities"""
 
 from abc import ABC, abstractmethod
 from typing import Sequence
diff --git a/qiskit_machine_learning/utils/loss_functions/loss_functions.py b/qiskit_machine_learning/utils/loss_functions/loss_functions.py
index 2d6a8ef1f..159b03db8 100644
--- a/qiskit_machine_learning/utils/loss_functions/loss_functions.py
+++ b/qiskit_machine_learning/utils/loss_functions/loss_functions.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Loss utilities """
+"""Loss utilities"""
 
 from abc import ABC, abstractmethod
 
diff --git a/requirements.txt b/requirements.txt
index a7e580480..eae5a4de8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 qiskit>=1.0,<2.0
 numpy>=2.0
-scipy>=1.4,<1.16
+scipy>=1.16
 scikit-learn>=1.2
 setuptools>=40.1
 dill>=0.3.4
diff --git a/test/__init__.py b/test/__init__.py
index 3d89bce89..a6da34c1f 100644
--- a/test/__init__.py
+++ b/test/__init__.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" ML test packages """
+"""ML test packages"""
 
 from .machine_learning_test_case import QiskitMachineLearningTestCase, gpu
 from .algorithms_test_case import QiskitAlgorithmsTestCase
diff --git a/test/algorithms/classifiers/test_fidelity_quantum_kernel_pegasos_qsvc.py b/test/algorithms/classifiers/test_fidelity_quantum_kernel_pegasos_qsvc.py
index 5de951b31..9d5112b62 100644
--- a/test/algorithms/classifiers/test_fidelity_quantum_kernel_pegasos_qsvc.py
+++ b/test/algorithms/classifiers/test_fidelity_quantum_kernel_pegasos_qsvc.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test Pegasos QSVC """
+"""Test Pegasos QSVC"""
 import os
 import tempfile
 import unittest
diff --git a/test/algorithms/classifiers/test_neural_network_classifier.py b/test/algorithms/classifiers/test_neural_network_classifier.py
index 06062cb19..13417d3c5 100644
--- a/test/algorithms/classifiers/test_neural_network_classifier.py
+++ b/test/algorithms/classifiers/test_neural_network_classifier.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-""" Test Neural Network Classifier """
+"""Test Neural Network Classifier"""
 from __future__ import annotations
 
 import itertools
@@ -379,7 +379,7 @@ def test_save_load(self, qnn_type):
             raise ValueError(f"Unsupported QNN type: {qnn_type}")
 
         classifier = self._create_classifier(
-            qnn, num_parameters=num_parameters, optimizer=COBYLA(), loss="squared_error"
+            qnn, num_parameters=num_parameters, optimizer=COBYLA(maxiter=25), loss="squared_error"
         )
         classifier.fit(features, labels)
 
diff --git a/test/algorithms/classifiers/test_pegasos_qsvc.py b/test/algorithms/classifiers/test_pegasos_qsvc.py
index 7d8e02756..1764e0aae 100644
--- a/test/algorithms/classifiers/test_pegasos_qsvc.py
+++ b/test/algorithms/classifiers/test_pegasos_qsvc.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test Pegasos QSVC """
+"""Test Pegasos QSVC"""
 import os
 import tempfile
 import unittest
diff --git a/test/algorithms/classifiers/test_qsvc.py b/test/algorithms/classifiers/test_qsvc.py
index ecbc2abb2..926d28c34 100644
--- a/test/algorithms/classifiers/test_qsvc.py
+++ b/test/algorithms/classifiers/test_qsvc.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test QSVC """
+"""Test QSVC"""
 import os
 import tempfile
 import unittest
diff --git a/test/algorithms/classifiers/test_vqc.py b/test/algorithms/classifiers/test_vqc.py
index 5f8c63445..d93ccb518 100644
--- a/test/algorithms/classifiers/test_vqc.py
+++ b/test/algorithms/classifiers/test_vqc.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test Neural Network Classifier """
+"""Test Neural Network Classifier"""
 
 from __future__ import annotations
 
diff --git a/test/algorithms/inference/test_qbayesian.py b/test/algorithms/inference/test_qbayesian.py
index 7409d857e..5c874c832 100644
--- a/test/algorithms/inference/test_qbayesian.py
+++ b/test/algorithms/inference/test_qbayesian.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test Quantum Bayesian Inference """
+"""Test Quantum Bayesian Inference"""
 
 import unittest
 from test import QiskitMachineLearningTestCase
diff --git a/test/algorithms/regressors/test_neural_network_regressor.py b/test/algorithms/regressors/test_neural_network_regressor.py
index 8e71203eb..62cfdffe5 100644
--- a/test/algorithms/regressors/test_neural_network_regressor.py
+++ b/test/algorithms/regressors/test_neural_network_regressor.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-""" Test Neural Network Regressor """
+"""Test Neural Network Regressor"""
 from __future__ import annotations
 
 import itertools
@@ -179,7 +179,7 @@ def test_save_load(self):
             input_params=feature_map.parameters,
             weight_params=ansatz.parameters,
         )
-        regressor = NeuralNetworkRegressor(qnn, optimizer=COBYLA())
+        regressor = NeuralNetworkRegressor(qnn, optimizer=COBYLA(maxiter=25))
         regressor.fit(features, labels)
 
         # predicted labels from the newly trained model
diff --git a/test/algorithms/regressors/test_vqr.py b/test/algorithms/regressors/test_vqr.py
index 6c66fba44..5c87d0bb3 100644
--- a/test/algorithms/regressors/test_vqr.py
+++ b/test/algorithms/regressors/test_vqr.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-""" Test Neural Network Regressor with EstimatorQNN."""
+"""Test Neural Network Regressor with EstimatorQNN."""
 
 import unittest
 from test import QiskitMachineLearningTestCase
diff --git a/test/datasets/__init__.py b/test/datasets/__init__.py
index aa2f128b2..5c8a5f732 100644
--- a/test/datasets/__init__.py
+++ b/test/datasets/__init__.py
@@ -10,4 +10,4 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test datasets module """
+"""Test datasets module"""
diff --git a/test/datasets/test_ad_hoc_data.py b/test/datasets/test_ad_hoc_data.py
index 448984726..4dcfcb462 100644
--- a/test/datasets/test_ad_hoc_data.py
+++ b/test/datasets/test_ad_hoc_data.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test Ad Hoc Data """
+"""Test Ad Hoc Data"""
 
 from test import QiskitMachineLearningTestCase
 
diff --git a/test/gradients/test_estimator_gradient.py b/test/gradients/test_estimator_gradient.py
index a36e39de7..54d6581bd 100644
--- a/test/gradients/test_estimator_gradient.py
+++ b/test/gradients/test_estimator_gradient.py
@@ -31,13 +31,14 @@
 from qiskit_ibm_runtime import Session, EstimatorV2
 from qiskit_ibm_runtime.options import EstimatorOptions, SimulatorOptions
 
+from logging_primitives import LoggingEstimator
+
 from qiskit_machine_learning.gradients import (
     LinCombEstimatorGradient,
     ParamShiftEstimatorGradient,
     SPSAEstimatorGradient,
 )
 
-from .logging_primitives import LoggingEstimator
 
 gradient_factories = [
     ParamShiftEstimatorGradient,
diff --git a/test/gradients/test_sampler_gradient.py b/test/gradients/test_sampler_gradient.py
index f5149b0eb..61d0b5d0b 100644
--- a/test/gradients/test_sampler_gradient.py
+++ b/test/gradients/test_sampler_gradient.py
@@ -30,13 +30,14 @@
 
 from qiskit_ibm_runtime import Session, SamplerV2
 
+from logging_primitives import LoggingSampler
+
 from qiskit_machine_learning.gradients import (
     LinCombSamplerGradient,
     ParamShiftSamplerGradient,
     SPSASamplerGradient,
 )
 
-from .logging_primitives import LoggingSampler
 
 gradient_factories = [
     ParamShiftSamplerGradient,
diff --git a/test/kernels/algorithms/test_fidelity_qkernel_trainer.py b/test/kernels/algorithms/test_fidelity_qkernel_trainer.py
index 9243d351d..2d3f0aecd 100644
--- a/test/kernels/algorithms/test_fidelity_qkernel_trainer.py
+++ b/test/kernels/algorithms/test_fidelity_qkernel_trainer.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test QuantumKernelTrainer """
+"""Test QuantumKernelTrainer"""
 from __future__ import annotations
 
 import unittest
diff --git a/test/kernels/test_trainable_fidelity_qkernel.py b/test/kernels/test_trainable_fidelity_qkernel.py
index 516270e02..b1eb92f0a 100644
--- a/test/kernels/test_trainable_fidelity_qkernel.py
+++ b/test/kernels/test_trainable_fidelity_qkernel.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-""" Test trainable quantum kernels using primitives """
+"""Test trainable quantum kernels using primitives"""
 
 import itertools
 import unittest
diff --git a/test/neural_networks/test_effective_dimension.py b/test/neural_networks/test_effective_dimension.py
index 6d61f74d5..7971ab995 100644
--- a/test/neural_networks/test_effective_dimension.py
+++ b/test/neural_networks/test_effective_dimension.py
@@ -9,7 +9,7 @@
 # Any modifications or derivative works of this code must retain this
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
-""" Unit Tests for Effective Dimension Algorithm """
+"""Unit Tests for Effective Dimension Algorithm"""
 
 import unittest
 
diff --git a/test/neural_networks/test_estimator_qnn_v1.py b/test/neural_networks/test_estimator_qnn_v1.py
index ff6853cde..f6baaa4a3 100644
--- a/test/neural_networks/test_estimator_qnn_v1.py
+++ b/test/neural_networks/test_estimator_qnn_v1.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test EstimatorQNN """
+"""Test EstimatorQNN"""
 
 import unittest
 
diff --git a/test/neural_networks/test_estimator_qnn_v2.py b/test/neural_networks/test_estimator_qnn_v2.py
index 646db1ea1..5d81b41be 100644
--- a/test/neural_networks/test_estimator_qnn_v2.py
+++ b/test/neural_networks/test_estimator_qnn_v2.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Test EstimatorQNN """
+"""Test EstimatorQNN"""
 
 import unittest
 
diff --git a/test/optimizers/test_optimizers.py b/test/optimizers/test_optimizers.py
index df253cd5d..023338edd 100644
--- a/test/optimizers/test_optimizers.py
+++ b/test/optimizers/test_optimizers.py
@@ -72,7 +72,7 @@ def run_optimizer(
             grad: Whether to pass the gradient function as input.
             bounds: Optimizer bounds.
         """
-        x_0 = np.asarray([1.3, 0.7, 0.8, 1.9, 1.2])
+        x_0 = np.asarray([1.13, 0.7, 0.8, 1.9, 1.2])
         jac = rosen_der if grad else None
 
         res = optimizer.minimize(rosen, x_0, jac, bounds)
diff --git a/tools/check_copyright.py b/tools/check_copyright.py
index 6085e0a17..919d68acf 100644
--- a/tools/check_copyright.py
+++ b/tools/check_copyright.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Fix copyright year in header """
+"""Fix copyright year in header"""
 
 from typing import Tuple, Union, List
 import builtins
diff --git a/tools/extract_deprecation.py b/tools/extract_deprecation.py
index 5a61d982b..ac902c309 100644
--- a/tools/extract_deprecation.py
+++ b/tools/extract_deprecation.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Extract deprecation messages from input """
+"""Extract deprecation messages from input"""
 
 from typing import List
 import sys
diff --git a/tools/generate_spell_dict.py b/tools/generate_spell_dict.py
index e20d1eec2..dc484e918 100644
--- a/tools/generate_spell_dict.py
+++ b/tools/generate_spell_dict.py
@@ -10,7 +10,7 @@
 # copyright notice, and modified files need to carry a notice indicating
 # that they have been altered from the originals.
 
-""" Generates spelling dictionaries for Sphinx and Pylint and combine them. """
+"""Generates spelling dictionaries for Sphinx and Pylint and combine them."""
 
 from typing import Set, List
 import sys