diff --git a/freqtrade/configuration/config_validation.py b/freqtrade/configuration/config_validation.py
index 606f081ef..0ee48cf91 100644
--- a/freqtrade/configuration/config_validation.py
+++ b/freqtrade/configuration/config_validation.py
@@ -27,10 +27,7 @@ def _extend_validator(validator_class):
             if 'default' in subschema:
                 instance.setdefault(prop, subschema['default'])
 
-        for error in validate_properties(
-            validator, properties, instance, schema,
-        ):
-            yield error
+        yield from validate_properties(validator, properties, instance, schema)
 
     return validators.extend(
         validator_class, {'properties': set_defaults}
diff --git a/freqtrade/freqai/RL/TensorboardCallback.py b/freqtrade/freqai/RL/TensorboardCallback.py
index 1828319cd..7f8c76956 100644
--- a/freqtrade/freqai/RL/TensorboardCallback.py
+++ b/freqtrade/freqai/RL/TensorboardCallback.py
@@ -13,7 +13,7 @@ class TensorboardCallback(BaseCallback):
     episodic summary reports.
     """
     def __init__(self, verbose=1, actions: Type[Enum] = BaseActions):
-        super(TensorboardCallback, self).__init__(verbose)
+        super().__init__(verbose)
         self.model: Any = None
         self.logger = None  # type: Any
         self.training_env: BaseEnvironment = None  # type: ignore
diff --git a/freqtrade/optimize/hyperopt_tools.py b/freqtrade/optimize/hyperopt_tools.py
index 93efbf644..e2133a956 100644
--- a/freqtrade/optimize/hyperopt_tools.py
+++ b/freqtrade/optimize/hyperopt_tools.py
@@ -464,7 +464,7 @@ class HyperoptTools():
 
         try:
             Path(csv_file).open('w+').close()
-        except IOError:
+        except OSError:
             logger.error(f"Failed to create CSV file: {csv_file}")
             return
 
diff --git a/freqtrade/vendor/qtpylib/indicators.py b/freqtrade/vendor/qtpylib/indicators.py
index 3da4f038d..63797d462 100644
--- a/freqtrade/vendor/qtpylib/indicators.py
+++ b/freqtrade/vendor/qtpylib/indicators.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # QTPyLib: Quantitative Trading Python Library
 # https://github.com/ranaroussi/qtpylib
 #
@@ -18,7 +16,6 @@
 # limitations under the License.
 #
 
-import sys
 import warnings
 from datetime import datetime, timedelta
 
@@ -27,11 +24,6 @@ import pandas as pd
 from pandas.core.base import PandasObject
 
 
-# =============================================
-# check min, python version
-if sys.version_info < (3, 4):
-    raise SystemError("QTPyLib requires Python version >= 3.4")
-
 # =============================================
 warnings.simplefilter(action="ignore", category=RuntimeWarning)
 
diff --git a/pyproject.toml b/pyproject.toml
index 71687961d..81ab50d40 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,15 +68,19 @@ target-version = "py38"
 extend-select = [
   "C90",    # mccabe
   # "N",    # pep8-naming
-  # "UP",   # pyupgrade
+  "UP",   # pyupgrade
   "TID",    # flake8-tidy-imports
   # "EXE",  # flake8-executable
   "YTT",    # flake8-2020
+  # "S",    # flake8-bandit
   # "DTZ",  # flake8-datetimez
   # "RSE",  # flake8-raise
   # "TCH",  # flake8-type-checking
-  "PTH",  # flake8-use-pathlib
+  "PTH",    # flake8-use-pathlib
 ]
 
 [tool.ruff.mccabe]
 max-complexity = 12
+
+[tool.ruff.per-file-ignores]
+"tests/*" = ["S"]