diff --git a/docs/conf.py b/docs/conf.py
index 0bc9b1e..59b1a45 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -1,5 +1,5 @@
-# Configuration file for the Sphinx documentation builder.
-#
+"""Configuration file for the Sphinx documentation builder."""
+
 # For the full list of built-in configuration values, see the documentation:
 # https://www.sphinx-doc.org/en/master/usage/configuration.html
 
diff --git a/pyproject.toml b/pyproject.toml
index aa79523..618c3e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,6 +28,29 @@ package = true
 [tool.ruff]
 line-length = 120
 
+[tool.ruff.lint]
+select = [
+  # ruff defaults:
+  "E4", "E7", "E9", "F",
+  "I", # flake8-import-order
+  "TID", # flake8-tidy-imports
+  "D", # google-style docstrings
+]
+ignore = [
+  "D202", # would require one blank line after the last section of a multi-line docstring
+  "D203", # would require one blank line at start of class docstring
+  "D213", # would require multi-line docstring to start with a hard return
+  "D401", # would require imperative mood in docstring
+  "D413", # would put blank line at end of each multiline docstring
+]
+
+[tool.ruff.lint.flake8-tidy-imports]
+ban-relative-imports = "all"
+
+[tool.ruff.lint.per-file-ignores]
+"__init__.py" = ["D104"] # would require module-level documentation
+"test_*.py" = ["D"]
+
 [tool.pyright]
 include = ["packio", "tests"]
 
diff --git a/tests/test_packio.py b/tests/test_packio.py
index 7a3a1e9..487404a 100644
--- a/tests/test_packio.py
+++ b/tests/test_packio.py
@@ -2,6 +2,7 @@
 
 import dummio
 import pandas as pd
+
 from packio import Reader, Writer