diff --git a/ci/pyproject.toml b/ci/pyproject.toml
index 522832799..38c6ef4d0 100644
--- a/ci/pyproject.toml
+++ b/ci/pyproject.toml
@@ -1,3 +1,10 @@
+[tool.ruff]
+target-version = "py311"
+line-length = 88
+
+select = ["E", "F", "I"]
+ignore = ["E501"]
+
 [tool.black]
 line-length = 88
 include = '\.pyi?$'
@@ -7,3 +14,18 @@ exclude = '''
   | \.mypy_cache
 )/
 '''
+
+[tool.mypy]
+python_version = "3.11"
+warn_redundant_casts = true
+disallow_untyped_calls = true
+disallow_untyped_defs = true
+no_implicit_optional = true
+
+[[tool.mypy.overrides]]
+module = "setuptools.*"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "pytest.*"
+ignore_missing_imports = true
diff --git a/ci/setup.cfg b/ci/setup.cfg
deleted file mode 100644
index ad9e4daea..000000000
--- a/ci/setup.cfg
+++ /dev/null
@@ -1,20 +0,0 @@
-[wheel]
-universal = 1
-
-[pycodestyle]
-max-line-length = 88
-ignore = E501,E741,W503
-
-[flake8]
-max-line-length = 88
-ignore = E501,E741,W503
-exclude = .git,__pycache__,docs/source/conf.py,old,build,dist
-
-[mypy-irc.*]
-ignore_missing_imports = True
-
-[mypy]
-warn_redundant_casts = true
-disallow_untyped_calls = true
-disallow_untyped_defs = true
-no_implicit_optional = true
diff --git a/ci/test.sh b/ci/test.sh
index 8fe052db7..144eb2897 100755
--- a/ci/test.sh
+++ b/ci/test.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env nix-shell
-#!nix-shell -p bash -i bash -p python3Packages.mypy -p python3Packages.black -p python3Packages.flake8 -p nix
+#!nix-shell -p bash -i bash -p mypy -p black -p ruff -p nix
 
 set -eux -o pipefail # Exit with nonzero exit code if anything fails
 
@@ -11,7 +11,7 @@ mypy nur
 # Format checker
 black --check .
 # Linter
-flake8 .
+ruff .
 
 cd "${DIR}/.."
 nix run "${DIR}#" -- format-manifest