diff --git a/pyproject.toml b/pyproject.toml
index 7fae398..30719be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,7 @@ testing = [
 ]
 linting = [
     "pytest",
+    "ruff",
     "mypy",
     "lxml",  # for mypy html coverage
 ]
diff --git a/ruff.toml b/ruff.toml
new file mode 100644
index 0000000..0be93e0
--- /dev/null
+++ b/ruff.toml
@@ -0,0 +1,25 @@
+ignore = [
+### too opinionated style checks
+    "E501",  # too long lines
+    "E702",  # Multiple statements on one line (semicolon)
+    "E731",  # assigning lambda instead of using def
+    "E741",  # Ambiguous variable name: `l`
+    "E742",  # Ambiguous class name: `O
+    "E401",  # Multiple imports on one line
+    "F403",  # import *` used; unable to detect undefined names
+###
+
+###
+    "E722",  # Do not use bare `except` ## Sometimes it's useful for defensive imports and that sort of thing..
+    "F811",  # Redefinition of unused  # this gets in the way of pytest fixtures (e.g. in cachew)
+
+## might be nice .. but later and I don't wanna make it strict
+    "E402",  # Module level import not at top of file
+
+### maybe consider these soon
+# sometimes it's useful to give a variable a name even if we don't use it as a documentation
+# on the other hand, often is a sign of error
+    "F841",  # Local variable `count` is assigned to but never used
+    "F401",  # imported but unused
+###
+]
diff --git a/src/orgparse/node.py b/src/orgparse/node.py
index 154a3e8..7ed1cdb 100644
--- a/src/orgparse/node.py
+++ b/src/orgparse/node.py
@@ -832,7 +832,7 @@ def level(self):
         :rtype: int
 
         """
-        raise NotImplemented
+        raise NotImplementedError
 
     def _get_tags(self, inher=False) -> Set[str]:
         """
diff --git a/tox.ini b/tox.ini
index 788cbb5..dc04b0e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,10 +1,10 @@
 [tox]
-minversion = 3.7
+minversion = 3.21
 # relies on the correct version of Python installed
-envlist = tests,mypy
+envlist = ruff,tests,mypy
 # https://github.com/tox-dev/tox/issues/20#issuecomment-247788333
 # hack to prevent .tox from crapping to the project directory
-toxworkdir={env:TOXWORKDIR_BASE:}{toxinidir}/.tox
+toxworkdir = {env:TOXWORKDIR_BASE:}{toxinidir}/.tox
 
 [testenv]
 # TODO how to get package name from setuptools?
@@ -18,6 +18,12 @@ passenv =
   PYTHONPYCACHEPREFIX
 
 
+[testenv:ruff]
+commands =
+    {envpython} -m pip install --use-pep517 -e .[linting]
+    {envpython} -m ruff src/
+
+
 # note: --use-pep517 here is necessary for tox --parallel flag to work properly
 # otherwise it seems that it tries to modify .eggs dir in parallel and it fails
 [testenv:tests]