diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 715999e..d518f9d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,10 +37,13 @@ jobs:
       - name: Install the workflow call library
         run: |
           python3 -m pip install .[docs,lint,tests]
-      - name: Run flake8
+      - name: Clean build files
         run: |
-          python3 -m flake8 .
-          python3 -m nbqa flake8 .
+          git clean -xdf
+      - name: Run ruff
+        run: |
+          python3 -m ruff .
+          python3 -m nbqa ruff .
       - name: Run isort
         run: |
           python3 -m isort --check --diff .
diff --git a/open_in_cloud_workflow/add_installation_cells.py b/open_in_cloud_workflow/add_installation_cells.py
index d62686b..bcfbd83 100644
--- a/open_in_cloud_workflow/add_installation_cells.py
+++ b/open_in_cloud_workflow/add_installation_cells.py
@@ -98,7 +98,7 @@ def _package_is_imported(package_import: str, cell: nbformat.NotebookNode) -> bo
     return f"import {package_import}" in cell.source or f"from {package_import}" in cell.source
 
 
-def __main__(
+def __main__(  # noqa: N807
     work_dir: str, nb_pattern: str, cloud_provider: str, fem_on_cloud_packages: str, pip_packages: str
 ) -> None:
     """Add installation cells on top of every notebook in the work directory matching the prescribed pattern."""
diff --git a/open_in_cloud_workflow/replace_images_in_markdown.py b/open_in_cloud_workflow/replace_images_in_markdown.py
index 6cefc24..7c7c523 100644
--- a/open_in_cloud_workflow/replace_images_in_markdown.py
+++ b/open_in_cloud_workflow/replace_images_in_markdown.py
@@ -32,7 +32,7 @@ def replace_images_in_markdown(
     return updated_nb_cells
 
 
-def __main__(work_dir: str, nb_pattern: str) -> None:
+def __main__(work_dir: str, nb_pattern: str) -> None:  # noqa: N807
     """Replace images in every notebook in the work directory matching the prescribed pattern."""
     images_as_base64 = glob_images(work_dir)
 
diff --git a/open_in_cloud_workflow/replace_links_in_markdown.py b/open_in_cloud_workflow/replace_links_in_markdown.py
index 60d3f91..b5d2f9a 100644
--- a/open_in_cloud_workflow/replace_links_in_markdown.py
+++ b/open_in_cloud_workflow/replace_links_in_markdown.py
@@ -44,7 +44,7 @@ def replace_links_in_markdown(
     return updated_nb_cells
 
 
-def __main__(
+def __main__(  # noqa: N807
     work_dir: str, nb_pattern: str, cloud_provider: str, publisher: typing.Union[str, PublishOnBaseClass]
 ) -> None:
     """Replace links in every notebook in the work directory matching the prescribed pattern."""
diff --git a/pyproject.toml b/pyproject.toml
index 1d756d1..2ff290c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -47,14 +47,9 @@ docs = [
     "sphinx"
 ]
 lint = [
-    "flake8",
-    "flake8-annotations",
-    "flake8-docstrings",
-    "flake8-import-restrictions",
-    "flake8-isort",
-    "Flake8-pyproject",
-    "flake8-quotes",
+    "isort",
     "mypy",
+    "ruff",
     "yamllint"
 ]
 tests = [
@@ -65,21 +60,6 @@ tests = [
     "requests"
 ]
 
-[tool.flake8]
-max-line-length = 120
-show-source = true
-docstring-convention = "numpy"
-inline-quotes = "double"
-imr241_exclude = ["open_in_cloud_workflow", "open_in_cloud_workflow.*"]
-imr245_include = "*"
-imr245_exclude = ["open_in_cloud_workflow", "open_in_cloud_workflow.*"]
-ignore = ["ANN101", "W503"]
-exclude = [".eggs", "build", "dist"]
-per-file-ignores = [
-    "open_in_cloud_workflow/__init__.py: F401",
-    "tests/data/**/*.py: D100, I004"
-]
-
 [tool.isort]
 line_length = 120
 multi_line_output = 4
@@ -90,7 +70,6 @@ combine_as_imports = true
 check_untyped_defs = true
 disallow_any_unimported = true
 disallow_untyped_defs = true
-exclude = "(^\\.eggs|^build|^dist|conftest\\.py$)"
 no_implicit_optional = true
 pretty = true
 show_error_codes = true
@@ -105,3 +84,18 @@ ignore_missing_imports = true
 [[tool.mypy.overrides]]
 module = "requests"
 ignore_missing_imports = true
+
+[tool.ruff]
+line-length = 120
+select = ["ANN", "D", "E", "F", "ICN", "N", "Q", "RUF", "W"]
+ignore = ["ANN101"]
+
+[tool.ruff.per-file-ignores]
+"open_in_cloud_workflow/__init__.py" = ["F401"]
+"tests/data/**/*.py" = ["D100"]
+
+[tool.ruff.pycodestyle]
+max-doc-length = 120
+
+[tool.ruff.pydocstyle]
+convention = "numpy"
diff --git a/tests/conftest.py b/tests/conftest.py
index 1819132..bd71aaa 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -25,34 +25,34 @@ def root_directory() -> str:
 @pytest.fixture
 def open_notebook(root_directory: str) -> typing.Callable[[str, str, typing.Optional[str]], nbformat.NotebookNode]:
     """Return a fixture to open a local notebook."""
-    def _(local_directory: str, filename: str, data_directory: str = None) -> nbformat.NotebookNode:
+    def _(  local_directory: str, filename: str, data_directory: typing.Optional[str] = None) -> nbformat.NotebookNode:
         """Open notebook with nbformat."""
         if data_directory is None:
             data_directory = os.path.join(root_directory, "tests", "data")
         filename = os.path.join(data_directory, local_directory, filename + ".ipynb")
         with open(filename, "r") as f:
-            nb = nbformat.read(f, as_version=4)
+            nb = nbformat.read(f, as_version=4)  # type: ignore[no-untyped-call]
         nb._filename = filename
-        return nb
+        return nb  # type: ignore[no-any-return]
     return _
 
 
 @pytest.fixture
 def publish_on_artifact() -> PublishOnArtifact:
     """Return an artifact publisher."""
-    return publish_on("artifact@open-in-colab")
+    return publish_on("artifact@open-in-colab")  # type: ignore[return-value]
 
 
 @pytest.fixture
 def publish_on_drive() -> PublishOnDrive:
     """Return a Google Drive publisher."""
-    return publish_on("drive@GitHub/open_in_colab_workflow")
+    return publish_on("drive@GitHub/open_in_colab_workflow")  # type: ignore[return-value]
 
 
 @pytest.fixture
 def publish_on_github() -> PublishOnGitHub:
     """Return a GitHub publisher."""
-    return publish_on("github@fem-on-colab/open-in-colab-workflow@open-in-colab")
+    return publish_on("github@fem-on-colab/open-in-colab-workflow@open-in-colab")  # type: ignore[return-value]
 
 
 @pytest.fixture(params=["publish_on_artifact", "publish_on_drive", "publish_on_github"])
@@ -60,4 +60,4 @@ def publisher(request: _pytest.fixtures.SubRequest) -> PublishOnBaseClass:
     """Parameterize over publishers."""
     if request.param == "publish_on_drive" and "RCLONE_CONFIG_DRIVE_TOKEN" not in os.environ:
         pytest.skip("Missing rclone environment variables")
-    return request.getfixturevalue(request.param)
+    return request.getfixturevalue(request.param)  # type: ignore[no-any-return]
diff --git a/tests/data/add_installation_cells/from_numpy_import.ipynb b/tests/data/add_installation_cells/from_numpy_import.ipynb
index c8f1b3e..62ea680 100644
--- a/tests/data/add_installation_cells/from_numpy_import.ipynb
+++ b/tests/data/add_installation_cells/from_numpy_import.ipynb
@@ -7,7 +7,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from numpy import *  # noqa: F401, F403, IMR241, IMR243, IMR245"
+    "from numpy import *  # noqa: F403"
    ]
   }
  ],
diff --git a/tests/data/add_installation_cells/import_mpi4py_numpy.ipynb b/tests/data/add_installation_cells/import_mpi4py_numpy.ipynb
index c5edbf3..da527c9 100644
--- a/tests/data/add_installation_cells/import_mpi4py_numpy.ipynb
+++ b/tests/data/add_installation_cells/import_mpi4py_numpy.ipynb
@@ -8,7 +8,7 @@
    "outputs": [],
    "source": [
     "import mpi4py  # type: ignore[import-not-found] # noqa: F401\n",
-    "import numpy  # noqa: F401"
+    "import numpy as np  # noqa: F401"
    ]
   }
  ],
diff --git a/tests/data/add_installation_cells/import_numpy.ipynb b/tests/data/add_installation_cells/import_numpy.ipynb
index d038790..e0eeba2 100644
--- a/tests/data/add_installation_cells/import_numpy.ipynb
+++ b/tests/data/add_installation_cells/import_numpy.ipynb
@@ -7,7 +7,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import numpy  # noqa: F401"
+    "import numpy as np  # noqa: F401"
    ]
   }
  ],
diff --git a/tests/data/add_installation_cells/import_numpy_markdown.ipynb b/tests/data/add_installation_cells/import_numpy_markdown.ipynb
index a0f7f8a..26eec52 100644
--- a/tests/data/add_installation_cells/import_numpy_markdown.ipynb
+++ b/tests/data/add_installation_cells/import_numpy_markdown.ipynb
@@ -15,7 +15,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import numpy  # noqa: F401"
+    "import numpy as np  # noqa: F401"
    ]
   }
  ],
diff --git a/tests/data/add_installation_cells/import_numpy_scipy.ipynb b/tests/data/add_installation_cells/import_numpy_scipy.ipynb
index 386b404..b4f4b0e 100644
--- a/tests/data/add_installation_cells/import_numpy_scipy.ipynb
+++ b/tests/data/add_installation_cells/import_numpy_scipy.ipynb
@@ -7,7 +7,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import numpy  # noqa: F401\n",
+    "import numpy as np  # noqa: F401\n",
     "import scipy  # type: ignore[import-not-found] # noqa: F401"
    ]
   }
diff --git a/tests/data/replace_images_in_markdown/image_and_code.ipynb b/tests/data/replace_images_in_markdown/image_and_code.ipynb
index 873c24b..8218541 100644
--- a/tests/data/replace_images_in_markdown/image_and_code.ipynb
+++ b/tests/data/replace_images_in_markdown/image_and_code.ipynb
@@ -16,7 +16,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import numpy  # noqa: F401"
+    "import numpy as np  # noqa: F401"
    ]
   }
  ],
diff --git a/tests/data/replace_links_in_markdown/link_and_code.ipynb b/tests/data/replace_links_in_markdown/link_and_code.ipynb
index 91c5d82..4e5da16 100644
--- a/tests/data/replace_links_in_markdown/link_and_code.ipynb
+++ b/tests/data/replace_links_in_markdown/link_and_code.ipynb
@@ -15,7 +15,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "import numpy  # noqa: F401"
+    "import numpy as np  # noqa: F401"
    ]
   }
  ],