diff --git a/.github/workflows/constraints.txt b/.github/workflows/constraints.txt
index e54ddf0..ef51d6e 100644
--- a/.github/workflows/constraints.txt
+++ b/.github/workflows/constraints.txt
@@ -1,5 +1,5 @@
-pip==23.0
-nox==2022.11.21
-nox-poetry==1.0.2
-poetry==1.2.2
-virtualenv==20.19.0
+pip==23.2.1
+nox==2023.4.22
+nox-poetry==1.0.3
+poetry==1.7.1
+virtualenv==20.16.6
diff --git a/noxfile.py b/noxfile.py
index 77dc15f..85586d0 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -22,11 +22,11 @@
 
 package = "ncdump_rich"
 python_versions = ["3.11", "3.10", "3.9"]
-nox.needs_version = ">= 2021.6.6"
+nox.needs_version = ">= 2023.4.22"
 nox.options.sessions = (
     "pre-commit",
     "mypy",
-    "black",
+    "ruff",
     "tests",
     "typeguard",
     "xdoctest",
@@ -45,11 +45,11 @@ def install_with_constraints(session: Session, *args: str, **kwargs: Any) -> Non
 
     Parameters
     ----------
-    session: Session
+    session : Session
         The Session object.
-    args: str
+    *args : str
         Command-line arguments for pip.
-    kwargs: Any
+    **kwargs : Any
         Additional keyword arguments for Session.install.
     """
     with tempfile.NamedTemporaryFile() as requirements:
@@ -76,7 +76,8 @@ def activate_virtualenv_in_precommit_hooks(session: Session) -> None:
 
     Parameters
     ----------
-    session: The Session object.
+    session : Session
+        The Session object.
     """
     if session.bin is None:
         return
@@ -124,17 +125,13 @@ def precommit(session: Session) -> None:
     """Lint using pre-commit."""
     args = session.posargs or ["run", "--all-files", "--show-diff-on-failure"]
     session.install(
-        "black",
-        "darglint",
-        "flake8",
-        "flake8-bandit",
-        "flake8-bugbear",
-        "flake8-docstrings",
-        "flake8-rst-docstrings",
-        "pep8-naming",
+        "ruff",
+        "pydoclint",
+        "mypy",
+        "pytest",
         "pre-commit",
         "pre-commit-hooks",
-        "reorder-python-imports",
+        "xdoctest",
     )
     session.run("pre-commit", *args)
     if args and args[0] == "install":
@@ -153,11 +150,11 @@ def mypy(session: Session) -> None:
 
 
 @session(python=python_versions)
-def black(session: Session) -> None:
-    """Format using black."""
+def ruff(session: Session) -> None:
+    """Format using ruff."""
     args = session.posargs or ["src", "tests", "docs/conf.py"]
-    session.install("black")
-    session.run("black", *args)
+    session.install("ruff")
+    session.run("ruff", *args)
 
 
 @session(python=python_versions)
diff --git a/pyproject.toml b/pyproject.toml
index 1179700..59dfb5a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,7 +83,6 @@ pretty = true
 show_column_numbers = true
 show_error_codes = true
 show_error_context = true
-strict = true
 strict_equality = true
 strict_optional = true
 warn_no_return = true
@@ -180,11 +179,10 @@ docstring-quotes = "double"
 numpy = "np"
 scipy = "sp"
 xarray = "xr"
-paper1_code = "core"
 
 [tool.ruff.isort]
 case-sensitive = true
-known-local-folder = ["src", "paper1_code"]
+known-local-folder = ["src", "ncdump_rich"]
 
 [tool.isort]
 multi_line_output = 3
diff --git a/tests/test_main.py b/tests/test_main.py
index e82cd2c..1419220 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -2,6 +2,7 @@
 import netCDF4
 import pytest
 from click.testing import CliRunner
+
 from ncdump_rich import __main__