diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 5ea94f16..bb124bf0 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -59,7 +59,11 @@ repos:
     hooks:
       - id: yesqa
 
-  - repo: https://github.com/PyCQA/flake8
-    rev: 6.0.0
+  - repo: https://github.com/charliermarsh/ruff-pre-commit
+    rev: v0.0.226
     hooks:
-      - id: flake8
+      - id: ruff
+        args:
+          - "--fix"
+          # Respect `exclude` and `extend-exclude` settings.
+          - "--force-exclude"
diff --git a/pyproject.toml b/pyproject.toml
index 03618c0c..2dc1cb88 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,10 +1,100 @@
+[metadata]
+license_file = "LICENSE"
+description-file = "README.md"
+
 [build-system]
 requires = [
     "setuptools",
     "wheel",
 ]
 
+[tool.check-manifest]
+ignore = [
+    "*.yml",
+    ".github",
+    ".github/*"
+]
+
+[tool.pytest.ini_options]
+norecursedirs = [
+    ".git",
+    ".github",
+    "dist",
+    "build",
+    "docs",
+]
+
+addopts = [
+    "--strict-markers",
+    "--doctest-modules",
+    "--durations=25",
+    "--color=yes",
+    "--disable-pytest-warnings",
+]
+filterwarnings = ["error::FutureWarning", "error::DeprecationWarning"]
+xfail_strict = true
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "pass",
+]
+
+[tool.coverage.run]
+parallel = true
+concurrency = "thread"
+relative_files = true
+
 [tool.black]
 # https://github.com/psf/black
 line-length = 120
 exclude = "(.eggs|.git|.hg|.mypy_cache|.venv|_build|buck-out|build|dist)"
+
+[tool.isort]
+known_first_party = [
+    "lightning_utilities",
+    "tests"
+]
+skip_glob = []
+profile = "black"
+line_length = 120
+order_by_type = false
+multi_line_output = 3
+include_trailing_comma = true
+
+[tool.mypy]
+files = [
+    "src/lightning_utilities",
+]
+disallow_untyped_defs = true
+ignore_missing_imports = true
+
+[tool.ruff]
+ line-length = 120
+ select = [
+     "E", "W",  # see: https://pypi.org/project/pycodestyle
+     "F",  # see: https://pypi.org/project/pyflakes
+ ]
+ ignore = [
+     "E731",
+ ]
+ exclude = [
+     ".eggs",
+     ".git",
+     ".mypy_cache",
+     ".ruff_cache",
+     "__pypackages__",
+     "_build",
+     "build",
+     "dist",
+     "docs"
+ ]
+ ignore-init-module-imports = true
+
+ # [tool.ruff.per-file-ignores]
+ # "setup.py" = ["D100", "SIM115"]
+ # "__about__.py" = ["D100"]
+ # "__init__.py" = ["D100"]
+
+ [tool.ruff.mccabe]
+ max-complexity = 10
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index cc49f4f9..00000000
--- a/setup.cfg
+++ /dev/null
@@ -1,67 +0,0 @@
-[tool:pytest]
-norecursedirs =
-    .git
-    dist
-    build
-addopts =
-    --strict-markers
-    --doctest-modules
-    --durations=25
-    --color=yes
-    --disable-pytest-warnings
-filterwarnings =
-    error::FutureWarning
-    error::DeprecationWarning
-xfail_strict = true
-
-[coverage:report]
-exclude_lines =
-    pragma: no-cover
-    pass
-
-[flake8]
-max-line-length = 120
-exclude = .tox,*.egg,build,temp
-select = E,W,F
-doctests = True
-verbose = 2
-# https://pep8.readthedocs.io/en/latest/intro.html#error-codes
-format = pylint
-ignore =
-    # Ignore "Do not assign a lambda expression, use a def"
-    E731
-    # Ignore "Line break occurred before a binary operator"
-    W503
-    # Ignore "whitespace before ':'"
-    E203
-
-# setup.cfg or tox.ini
-[check-manifest]
-ignore =
-    *.yml
-    .github
-    .github/*
-
-[metadata]
-license_files = LICENSE
-description_file = README.md
-# long_description = file:README.md
-# long_description_content_type = text/markdown
-
-[isort]
-known_first_party =
-    lightning_utilities
-    tests
-line_length = 120
-order_by_type = False
-# 3 - Vertical Hanging Indent
-multi_line_output = 3
-include_trailing_comma = True
-
-[mypy]
-# Typing tests is low priority, but enabling type checking on the
-# untyped test functions (using `--check-untyped-defs`) is still
-# high-value because it helps test the typing.
-files = src/lightning_utilities
-disallow_untyped_defs = True
-ignore_missing_imports = True
diff --git a/src/lightning_utilities/core/imports.py b/src/lightning_utilities/core/imports.py
index 0e13b1b9..ee980b9f 100644
--- a/src/lightning_utilities/core/imports.py
+++ b/src/lightning_utilities/core/imports.py
@@ -4,8 +4,6 @@
 
 import functools
 import importlib
-import operator
-import os
 import warnings
 from functools import lru_cache
 from importlib.util import find_spec