diff --git a/MANIFEST.in b/MANIFEST.in
index 8f0af734..df94c77e 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -6,7 +6,6 @@ include LICENSE
 include Makefile
 include README.rst
 include requirements-dev.txt
-include requirements-flake8.txt
 include SECURITY.md
 include tox.ini
 
diff --git a/Makefile b/Makefile
index f66f8019..51c3b265 100644
--- a/Makefile
+++ b/Makefile
@@ -14,11 +14,13 @@ test:  ## Run tests
 docs:  ## Build docs
 	tox -e py310-docs
 
+.PHONY: format
+format:  ## Format Python files
+	tox exec -e py310-lint -- ruff format --target-version=py310 --exclude=_vendor setup.py bleach/ tests/ tests_website/
+
 .PHONY: lint
 lint:  ## Lint files
-	tox exec -e py310-format-check -- black --target-version=py310 --exclude=_vendor setup.py bleach/ tests/ tests_website/
 	tox -e py310-lint
-	tox -e py310-format-check
 
 .PHONY: vendorverify
 vendorverify:  ## Verify vendored files
diff --git a/bleach/linkifier.py b/bleach/linkifier.py
index 8fcefb2c..c9513509 100644
--- a/bleach/linkifier.py
+++ b/bleach/linkifier.py
@@ -48,9 +48,7 @@ def build_url_re(tlds=TLDS, protocols=html5lib_shim.allowed_protocols):
         (?:[/?][^\s\{{\}}\|\\\^`<>"]*)?
             # /path/zz (excluding "unsafe" chars from RFC 3986,
             # except for # and ~, which happen in practice)
-        """.format(
-            "|".join(sorted(protocols)), "|".join(sorted(tlds))
-        ),
+        """.format("|".join(sorted(protocols)), "|".join(sorted(tlds))),
         re.IGNORECASE | re.VERBOSE | re.UNICODE,
     )
 
@@ -81,9 +79,7 @@ def build_email_re(tlds=TLDS):
         |^"([\001-\010\013\014\016-\037!#-\[\]-\177]
             |\\[\001-\011\013\014\016-\177])*"  # quoted-string
         )@(?:[A-Z0-9](?:[A-Z0-9-]{{0,61}}[A-Z0-9])?\.)+(?:{0}))  # domain
-        """.format(
-            "|".join(tlds)
-        ),
+        """.format("|".join(tlds)),
         re.IGNORECASE | re.MULTILINE | re.VERBOSE,
     )
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 0cae69ec..5f4b7a93 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,9 +1,9 @@
 -e .
 
-black==24.4.2; implementation_name == 'cpython'
 build==1.2.1
 mypy==1.10.1; implementation_name =='cpython'
 pytest==8.2.2
+ruff==0.15.6; implementation_name == 'cpython'
 setuptools==80.7.1
 tox==4.16.0
 tox-gh-actions==3.2.0
diff --git a/requirements-flake8.txt b/requirements-flake8.txt
deleted file mode 100644
index 806cdff7..00000000
--- a/requirements-flake8.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-# Requirements for running flake8
-flake8==6.0.0
diff --git a/setup.cfg b/setup.cfg
index f631ecc9..43d61f27 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,19 +1,3 @@
-[flake8]
-exclude =
-    .git/,
-    .tox/,
-    bleach/_vendor/*
-ignore =
-    # E203: whitespace before ":"; doesn't work with black
-    E203,
-    # E501: line too long
-    E501,
-    # E731: do not assign a lambda expression, use a def
-    E731,
-    # W503: line break before opertor; this doesn't work with black
-    W503
-max-line-length = 88
-
 [tool:pytest]
 filterwarnings =
     error
diff --git a/tests/test_clean.py b/tests/test_clean.py
index 86ee129b..5a13cfaf 100644
--- a/tests/test_clean.py
+++ b/tests/test_clean.py
@@ -416,11 +416,14 @@ def test_poster_attribute():
 
 def test_attributes_callable():
     """Verify attributes can take a callable"""
-    ATTRS = lambda tag, name, val: name == "title"
+
+    def attrs_fun(tag, name, val):
+        return name == "title"
+
     TAGS = {"a"}
 
     text = '<a href="/foo" title="blah">example</a>'
-    assert clean(text, tags=TAGS, attributes=ATTRS) == '<a title="blah">example</a>'
+    assert clean(text, tags=TAGS, attributes=attrs_fun) == '<a title="blah">example</a>'
 
 
 def test_attributes_wildcard():
diff --git a/tox.ini b/tox.ini
index 600d70d9..948bd6b1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,6 @@ envlist =
     py{310,311,312,313,314,py3}-tinycss2
     py{310,311,312,313,314}-build-no-lang
     py310-docs
-    py310-format-check
     py310-lint
     py310-vendorverify
 
@@ -93,10 +92,10 @@ commands =
 
 [testenv:py310-lint]
 changedir = {toxinidir}
-deps = -rrequirements-flake8.txt
 platform = linux
 commands =
-    flake8 setup.py tests/ bleach/ tests_website/
+    ruff format --check --target-version=py310 --exclude=_vendor setup.py bleach/ tests/ tests_website/
+    ruff check --target-version=py310 --exclude=_vendor setup.py bleach/ tests/ tests_website/
 
 [testenv:py310-vendorverify]
 allowlist_externals = {toxinidir}/scripts/vendor_verify.sh
@@ -106,13 +105,6 @@ platform = linux
 commands =
     {toxinidir}/scripts/vendor_verify.sh
 
-[testenv:py310-format-check]
-changedir = {toxinidir}
-deps = -rrequirements-dev.txt
-platform = linux
-commands =
-    black --target-version=py310 --check --diff --exclude=_vendor setup.py bleach/ tests/ tests_website/
-
 [testenv:py310-docs]
 changedir = docs
 deps = -rrequirements-dev.txt