diff --git a/Makefile b/Makefile
index f24e3b9bc1..5f88be85ea 100644
--- a/Makefile
+++ b/Makefile
@@ -17,10 +17,6 @@ test-black:
 test-codespell:
 	tox run -e lint-codespell
 
-.PHONY: test-isort
-test-isort:
-	tox run -e lint-isort
-
 .PHONY: test-mypy
 test-mypy:
 	tox run -e lint-mypy
@@ -39,8 +35,7 @@ test-pyright:
 
 .PHONY: test-ruff
 test-ruff:
-	ruff --config snapcraft_legacy/ruff.toml $(SOURCES_LEGACY)
-	ruff $(SOURCES)
+	ruff check
 
 .PHONY: test-shellcheck
 test-shellcheck:
@@ -58,7 +53,7 @@ test-units: test-legacy-units
 tests: tests-static test-units
 
 .PHONY: tests-static
-tests-static: test-black test-codespell test-ruff test-isort test-mypy test-pydocstyle test-pyright test-pylint test-shellcheck
+tests-static: test-black test-codespell test-ruff test-mypy test-pydocstyle test-pyright test-pylint test-shellcheck
 
 .PHONY: lint
 lint: tests-static
diff --git a/pyproject.toml b/pyproject.toml
index 53c4391636..b9d7982fa5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,17 +10,6 @@ extend-exclude = '''
 # en masse later.
 target_version = ["py310", "py311"]
 
-[tool.isort]
-# black-compatible isort configuration
-multi_line_output = 3
-include_trailing_comma = true
-force_grid_wrap = 0
-use_parentheses = true
-ensure_newline_before_comments = true
-line_length = 88
-skip_gitignore = true
-skip = ["tests/spread/tools/snapd-testing-tools"]
-
 [tool.pylint.main]
 ignore-paths = ["tests/legacy"]
 
@@ -83,7 +72,7 @@ extend-exclude = [
     "legacy",
     "tests/legacy",
 ]
-select = [
+lint.select = [
     "E", "F",  # The rules built into Flake8
     "I",  # isort checking
     "PLC", "PLE", "PLR", "PLW",  # Pylint
@@ -102,7 +91,7 @@ select = [
     "Q",  # Consistent quotations
     "RET",  # Return values
 ]
-ignore = [
+lint.ignore = [
     # These following copy the flake8 configuration
     #"E203",  # Whitespace before ":"  -- Commented because ruff doesn't currently check E203
     "E501",  # Line too long
@@ -128,13 +117,6 @@ ignore = [
     # Disabled because the current code breaks these rules without "noqa" comments
     # Most of these are probably worth enabling eventually.
 
-    # 3 instances of breaking N802, all from overriding do_GET in http.server.BaseHTTPRequestHandler
-    # We can probably noqa these and enable the rule
-    "N802",  # Function names should be lowercase.
-    # 3 instances of N805, all PyDantic validators (which are classmethods).
-    # These have pylint disablers, but ruff doesn't understand those (yet).
-    # https://github.com/charliermarsh/ruff/issues/1203
-    "N805",  # First argument of a method should be named `self`
     # Annotation issues appear to be mostly in older code, so could be eventually enabled.
     # 39 instances of ANN001.
     "ANN001",  # Missing type annotation for function argument
@@ -144,24 +126,20 @@ ignore = [
     "ANN206",
     # 4 instances - would break if run with optimization
     "S101", # Use of assert detected
-    # 1 instance, disabled for pylint
-    "BLE001",
     # Comprehensions - IDK, these ones flagged and they really could go either way.
     "C405", "C408", "C414",
-    "Q000", # 2 single-quoted strings - probably accidental
     "RET504", "RET506",  # Return value related.
     "PLR2004",  # Magic values - widely used
-    "PLC1901",  # Checking for empty string vs. falsey - many of these
     "S603",  # Untrusted input for subprocess calls
     "S604",  # shell=True parameter to a function
     "S607",  # Partial executable path for subprocess calls
 ]
 
-[tool.ruff.pylint]
+[tool.ruff.lint.pylint]
 max-args = 6
 max-branches = 16
 
-[tool.ruff.per-file-ignores]
+[tool.ruff.lint.per-file-ignores]
 "tests/**.py" = [
     "D",  # Ignore docstring rules in tests
     "ANN", # Ignore type annotations in tests
@@ -175,9 +153,8 @@ max-branches = 16
 ]
 "tests/unit/parts/plugins/test_kernel.py" = [
     "E101",  # Mixed tabs and spaces. Ruff gets confused by tabs in multiline strings
-    "W191",  # Indentation contains tabs - another Ruff false positive
 ]
 "__init__.py" = ["I001"]  # Imports in __init__ filesare allowed to be out of order
 
-[tool.ruff.flake8-annotations]
+[tool.ruff.lint.flake8-annotations]
 suppress-none-returning = true  # We don't need to explicitly point out that a function doesn't return anything
diff --git a/requirements-devel.txt b/requirements-devel.txt
index 95c169a47a..b4d789bd7d 100644
--- a/requirements-devel.txt
+++ b/requirements-devel.txt
@@ -32,7 +32,6 @@ hupper==1.12.1
 idna==3.7
 importlib-metadata==7.0.1
 iniconfig==2.0.0
-isort==5.13.2
 jaraco.classes==3.3.1
 jeepney==0.8.0
 jsonschema==2.5.1
diff --git a/setup.py b/setup.py
index b752880b6e..850faaec77 100755
--- a/setup.py
+++ b/setup.py
@@ -64,7 +64,6 @@ def recursive_data_files(directory, install_directory):
     "coverage[toml]",
     "pyflakes",
     "fixtures",
-    "isort",
     "mccabe",
     "mypy",
     "testscenarios",
diff --git a/snapcraft/elf/_elf_file.py b/snapcraft/elf/_elf_file.py
index f27d4e4f54..1f61ff5a7c 100644
--- a/snapcraft/elf/_elf_file.py
+++ b/snapcraft/elf/_elf_file.py
@@ -234,7 +234,7 @@ def is_elf(cls, path: Path) -> bool:
 
     # pylint: disable=too-many-branches
 
-    def _extract_attributes(self) -> None:  # noqa: C901
+    def _extract_attributes(self) -> None:  # noqa: C901,PLR0912
         with self.path.open("rb") as file:
             elf_file = elffile.ELFFile(file)
 
diff --git a/snapcraft_legacy/__init__.py b/snapcraft_legacy/__init__.py
index 385d291eb0..62ca6a9080 100644
--- a/snapcraft_legacy/__init__.py
+++ b/snapcraft_legacy/__init__.py
@@ -337,10 +337,10 @@ def _get_version():
 __version__ = _get_version()
 
 # Workaround for potential import loops.
-from snapcraft_legacy.internal import repo  # noqa isort:skip
+from snapcraft_legacy.internal import repo  # noqa
 
 # For backwards compatibility with external plugins.
-import snapcraft_legacy._legacy_loader  # noqa isort:skip
+import snapcraft_legacy._legacy_loader  # noqa
 from snapcraft_legacy import common  # noqa
 from snapcraft_legacy import extractors  # noqa
 from snapcraft_legacy import file_utils  # noqa
@@ -363,4 +363,4 @@ def _get_version():
     validate,
 )
 
-from snapcraft_legacy.project._project_options import ProjectOptions  # noqa isort:skip
+from snapcraft_legacy.project._project_options import ProjectOptions  # noqa
diff --git a/snapcraft_legacy/ruff.toml b/snapcraft_legacy/ruff.toml
index a93c2ef9e1..e344c89068 100644
--- a/snapcraft_legacy/ruff.toml
+++ b/snapcraft_legacy/ruff.toml
@@ -7,16 +7,19 @@ extend-exclude = [
     "stage",
     "prime",
 ]
-ignore = ["E501"]
+lint.ignore = [
+    "E101",  # Mixed spaces and tabs
+    "E501",
+]
 line-length = 88
-select = [
+lint.select = [
     "C9",
     "E",
     "F",
     "W",
 ]
 
-[per-file-ignores]
+[lint.per-file-ignores]
 "snapcraft_legacy/plugins/v2/_kernel_build.py" = [
     "E101",  # Mixed tabs and spaces. Ruff gets confused by tabs in multiline strings
     "W191",  # Indentation contains tabs - another Ruff false positive
@@ -29,5 +32,5 @@ select = [
     "E721",  # Allowing type comparison
 ]
 
-[mccabe]
+[lint.mccabe]
 max-complexity = 10
diff --git a/snapcraft_legacy/storeapi/__init__.py b/snapcraft_legacy/storeapi/__init__.py
index e5678f039a..cd49b83bfa 100644
--- a/snapcraft_legacy/storeapi/__init__.py
+++ b/snapcraft_legacy/storeapi/__init__.py
@@ -16,10 +16,10 @@
 
 import logging
 
-from . import errors  # isort:skip
-from . import channels  # isort:skip
-from . import constants  # isort:skip
-from . import status  # isort:skip
+from . import errors
+from . import channels
+from . import constants
+from . import status
 
 logger = logging.getLogger(__name__)
 
diff --git a/tests/unit/meta/test_appstream.py b/tests/unit/meta/test_appstream.py
index d8e6936455..0ceff374b0 100644
--- a/tests/unit/meta/test_appstream.py
+++ b/tests/unit/meta/test_appstream.py
@@ -139,7 +139,7 @@ def _expect_icon(self, icon):
         assert actual is not None
         assert actual.icon == expected.icon
 
-    def test_appstream_NxN_size_not_int_is_skipped(self):
+    def test_appstream_nxn_size_not_int_is_skipped(self):
         self._create_appstream_file(icon="icon", icon_type="stock")
         dir_name = os.path.join("usr", "share", "icons", "hicolor", "NxN")
         os.makedirs(dir_name)
diff --git a/tox.ini b/tox.ini
index c11b236a31..1edf261c4c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,14 +7,13 @@
 # * Additional test environment "noreq" runs all the tests without requirements.txt
 # * lint-shellcheck includes spread-shellcheck.py
 # * Additional ruff configuration for snapcraft_legacy
-# * Include isort
 # * Do not use tmpfs for a temporary directory as it does not support user xattrs
 # * Legacy tests (inherited from integration tests) include coverage
 # * Pylint included
 
 [tox]
 env_list =  # Environments to run when called with no parameters.
-    lint-{black,ruff,isort,mypy,pylint,pyright,shellcheck,codespell,yaml}
+    lint-{black,ruff,mypy,pylint,pyright,shellcheck,codespell,yaml}
     test-py310
     test-legacy-py310
 minversion = 4.5
@@ -87,7 +86,7 @@ find = git ls-files --empty-directory --deduplicate
 filter = file --mime-type -Nnf- | grep shellscript$ | cut -f1 -d:
 spread_filter = grep -E "^tests/spread/.*(spread|task)\.yaml$"
 
-[testenv:lint-{black,ruff,docstyle,isort,shellcheck,codespell,yaml}]
+[testenv:lint-{black,ruff,docstyle,shellcheck,codespell,yaml}]
 description = Lint the source code
 base = testenv, lint
 labels = lint
@@ -99,9 +98,7 @@ commands_pre =
     shellcheck: bash -c '{[shellcheck]find} | {[shellcheck]spread_filter} > {env_tmp_dir}/spread_shellcheck_files'
 commands =
     black: black --check --diff {tty:--color} {posargs} .
-    ruff: ruff --diff --respect-gitignore setup.py snapcraft tests tools
-    ruff: ruff --config snapcraft_legacy/ruff.toml snapcraft_legacy tests/legacy
-    isort: isort --check snapcraft snapcraft_legacy tests setup.py tools
+    ruff: ruff check --diff --respect-gitignore {posargs}
     docstyle: pydocstyle snapcraft
     shellcheck: xargs -ra {env_tmp_dir}/shellcheck_files shellcheck
     shellcheck: xargs -ra {env_tmp_dir}/spread_shellcheck_files python3 tools/spread-shellcheck.py spread.yaml