diff --git a/pyproject.toml b/pyproject.toml
index a9c3788..1a4f084 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,9 +39,12 @@ branch = true
 show_missing = true
 
 [tool.pytest.ini_options]
+asyncio_mode = "auto"
 minversion = "6.0"
 log_cli_level = "INFO"
-asyncio_mode = "auto"
+markers = [
+  'setup: marks tests as setup (deselect with -m "not setup")'
+]
 
 # Linting tools configuration
 [tool.ruff]
@@ -70,8 +73,22 @@ per-file-ignores = {"tests/*" = ["D100","D101","D102","D103","D104"]}
 [tool.ruff.lint.pydocstyle]
 convention = "google"
 
+[tool.ruff.lint.mccabe]
+max-complexity = 15
+
+[tool.ruff.lint.pep8-naming]
+# Allow Pydantic's `@validator` decorator to trigger class method treatment.
+classmethod-decorators = ["classmethod", "pydantic.validator"]
+
+[tool.ruff.format]
+docstring-code-format = true
+
 [tool.pyright]
 include = ["src"]
 extraPaths = ["lib"]
-pythonVersion = "3.8"
 pythonPlatform = "Linux"
+reportUnknownParameterType = true
+
+[tool.codespell]
+skip = ".git,build,.venv"
+ignore-words-list = "assertIn,aNULL"
diff --git a/src/charm.py b/src/charm.py
index ab83c7f..1643900 100755
--- a/src/charm.py
+++ b/src/charm.py
@@ -38,7 +38,7 @@ class MimirWorkerK8SOperatorCharm(CharmBase):
     _name = "mimir"
     _mimir_port = 8080
 
-    def __init__(self, *args):
+    def __init__(self, *args):  # type: ignore
         super().__init__(*args)
         self.worker = Worker(
             charm=self,