diff --git a/.flake8 b/.flake8
deleted file mode 100644
index 94fbdfe5..00000000
--- a/.flake8
+++ /dev/null
@@ -1,16 +0,0 @@
-# flake8 doesn't allow for pyproject.toml configuration.
-[flake8]
-# https://flake8.readthedocs.org/en/latest/
-exclude=\
-    venv*/*,\
-    local/*,\
-    docs/*,\
-    build/*,\
-    tests/apps/*,\
-    .eggs/*,\
-    .tox/*
-max-line-length = 119
-extend-ignore =
-    # whitespace before :
-    # See https://github.com/PyCQA/pycodestyle/issues/373
-    E203,
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 97ee4564..12e9ea21 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,13 +30,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.9", "3.10", "3.11", "3.12", "3.13" ]
+        python-version: [ "3.10", "3.11", "3.12", "3.13" ]
         runs-on: [ "macos-latest" ]
 
-        exclude:
+        include:
           # Don't need to run x86 tests on every Python version
           - python-version: "3.13"
-            runs-on: "macos-13"
+            runs-on: "macos-15-intel"
 
     steps:
     - name: Checkout
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 4b75309e..8609db37 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -13,31 +13,18 @@ repos:
     rev: v0.11.0.1
     hooks:
       - id: shellcheck
-  - repo: https://github.com/PyCQA/isort
-    rev: 7.0.0
-    hooks:
-      - id: isort
-        additional_dependencies: [toml]
-  - repo: https://github.com/asottile/pyupgrade
-    rev: v3.21.0
-    hooks:
-      - id: pyupgrade
-        args: [--py39-plus]
   # Docformatter 1.7.5 isn't compatible with Pre-commit 4.0
   # - repo: https://github.com/PyCQA/docformatter
   #   rev: v1.7.5
   #   hooks:
   #     - id: docformatter
   #       args: [--in-place, --black]
-  - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 25.9.0
-    hooks:
-      - id: black
-        language_version: python3
-  - repo: https://github.com/PyCQA/flake8
-    rev: 7.3.0
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.14.2
     hooks:
-      - id: flake8
+      - id: ruff-format
+      - id: ruff-check
+        args: [ --fix ]
   - repo: https://github.com/codespell-project/codespell
     rev: v2.4.1
     hooks:
diff --git a/pyproject.toml b/pyproject.toml
index 05de5cbc..6dc69f4e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "mobile-forge"
 version = "2024.0.0"
 description = "A tool to manage building cross-platform binary wheels for mobile devices"
 readme = { file = "README.md", content-type = "text/x-rst"}
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = { file = "LICENSE" }
 authors = [
     {name = "Russell Keith-Magee", email = "russell@keith-magee.com"}
@@ -20,10 +20,10 @@ classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Programming Language :: Python :: 3 :: Only",
     "Topic :: Software Development",
 ]
@@ -54,14 +54,23 @@ Tracker = "https://github.com/beeware/briefcase/issues"
 forge = "forge.__main__:main"
 forge-env = "forge.cross:main"
 
-[tool.isort]
-profile = "black"
-skip_glob = [
-    "docs/conf.py",
-    "venv*",
-    "local",
+[tool.ruff.lint]
+# In addition to the default rules, these additional rules will be used:
+extend-select = [
+    "E",      # pycodestyle
+    "W",      # pycodestyle
+    "F",      # pyflakes
+    "UP",     # pyupgrade
+    "B",      # flake8-bugbear
+    "YTT",    # flake8-2020
+    "ASYNC",  # flake8-async
+    "C4",     # flake8-comprehensions
+    "I",      # isort
+    # The SIM rules are *very* opinionated, and don't necessarily make for better code.
+    # They may be worth occasionally turning on just to see if something could actually
+    # use improvement.
+    # "SIM",    # flake8-simplify
 ]
-multi_line_output = 3
 
 [tool.codespell]
 skip = '.git,*.pdf,*.svg'
diff --git a/recipes/numpy/test_numpy.py b/recipes/numpy/test_numpy.py
index ee7122bf..ba133d66 100644
--- a/recipes/numpy/test_numpy.py
+++ b/recipes/numpy/test_numpy.py
@@ -15,8 +15,8 @@ def test_performance():
     b = np.random.rand(SIZE, SIZE)
     np.dot(a, b)
 
-    # With OpenBLAS, the test devices take at most 0.4 seconds. Without OpenBLAS, they take
-    # at least 1.0 seconds.
+    # With OpenBLAS, the test devices take at most 0.4 seconds.
+    # Without OpenBLAS, they take at least 1.0 seconds.
     duration = time() - start_time
     print(f"{duration:.3f}")
     assert duration < 0.7
diff --git a/recipes/pandas/test_pandas.py b/recipes/pandas/test_pandas.py
index f1c703e8..9708408a 100644
--- a/recipes/pandas/test_pandas.py
+++ b/recipes/pandas/test_pandas.py
@@ -6,5 +6,8 @@ def test_basic():
         columns=["Letter", "Number"],
     )
     assert df.to_csv() == (
-        ",Letter,Number\n" "0,alpha,1\n" "1,bravo,2\n" "2,charlie,3\n"
+        ",Letter,Number\n",
+        "0,alpha,1\n",
+        "1,bravo,2\n",
+        "2,charlie,3\n",
     )
diff --git a/src/forge/__main__.py b/src/forge/__main__.py
index 4c86fc00..6d7b949a 100644
--- a/src/forge/__main__.py
+++ b/src/forge/__main__.py
@@ -230,7 +230,8 @@ def main() -> int:
             # subsequent builds will be isolated by
 
             first = True
-            # Packages that generate -py3-none-any wheels only need to be built on a single platform.
+            # Packages that generate -py3-none-any wheels only need to be built
+            # on a single platform.
             if package_name_or_recipe in py_any_targets:
                 build_platforms = platforms[:1]
             else:
diff --git a/src/forge/build.py b/src/forge/build.py
index 3f458647..9ca24072 100644
--- a/src/forge/build.py
+++ b/src/forge/build.py
@@ -221,11 +221,13 @@ def compile_env(self, **kwargs) -> dict[str:str]:
 
         cflags = self.cross_venv.sysconfig_data["CFLAGS"]
 
-        # Pre Python 3.11 versions included BZip2 and XZ includes in CFLAGS. Remove them.
+        # Pre Python 3.11 versions included BZip2 and XZ includes in CFLAGS.
+        # The should be removed.
         cflags = re.sub(r"-I.*/merge/iOS/.*/bzip2-.*/include", "", cflags)
         cflags = re.sub(r"-I.*/merge/iOS/.*/xs-.*/include", "", cflags)
 
-        # Replace any hard-coded reference to --sysroot=<sysroot> with the actual reference
+        # Replace any hard-coded reference to --sysroot=<sysroot>
+        # with the actual reference
         cflags = re.sub(r"--sysroot=\w+", f"--sysroot={sdk_root}", cflags)
 
         # Add the install root and SDK root includes
@@ -240,7 +242,8 @@ def compile_env(self, **kwargs) -> dict[str:str]:
 
         ldflags = self.cross_venv.sysconfig_data["LDFLAGS"]
 
-        # Replace any hard-coded reference to -isysroot <sysroot> with the actual reference
+        # Replace any hard-coded reference to -isysroot <sysroot>
+        # with the actual reference
         ldflags = re.sub(r"-isysroot \w+", f"-isysroot={sdk_root}", ldflags)
 
         # Add the framework path
@@ -489,7 +492,10 @@ def log_file_path(self) -> Path:
         return (
             Path.cwd()
             / "logs"
-            / f"{self.package.name}-{self.package.version}-cp3{sys.version_info.minor}-{self.cross_venv.tag}.log"
+            / (
+                f"{self.package.name}-{self.package.version}-"
+                f"cp3{sys.version_info.minor}-{self.cross_venv.tag}.log"
+            )
         )
 
     def download_source_url(self):
diff --git a/src/forge/cross.py b/src/forge/cross.py
index e1b9ffda..88c755ad 100644
--- a/src/forge/cross.py
+++ b/src/forge/cross.py
@@ -244,8 +244,10 @@ def create(
                 ],
                 **self.cross_kwargs({}),
             )
-        except subprocess.CalledProcessError:
-            raise RuntimeError(f"Unable to create cross platform environment {self}.")
+        except subprocess.CalledProcessError as e:
+            raise RuntimeError(
+                f"Unable to create cross platform environment {self}."
+            ) from e
 
         print("Verifying cross-platform environment...")
         self.verify()
@@ -294,7 +296,8 @@ def verify(self):
         ).strip()
         if output != self.platform_identifier:
             raise RuntimeError(
-                f"Cross platform python should be {self.platform_identifier}; got {output}"
+                f"Cross platform python should be {self.platform_identifier}; "
+                f"got {output}"
             )
 
         # python is the same version as the local python
@@ -305,7 +308,8 @@ def verify(self):
         ).strip()
         if python_version != local_python_version:
             raise RuntimeError(
-                f"Cross platform python should be {local_python_version!r}; got {python_version!r}"
+                f"Cross platform python should be {local_python_version!r}; "
+                f"got {python_version!r}"
             )
 
         # build-python returns the build environment tag.
@@ -315,7 +319,8 @@ def verify(self):
         ).strip()
         if output != sysconfig.get_platform():
             raise RuntimeError(
-                f"Cross platform build-python should be {sysconfig.get_platform()}; got {output}"
+                f"Cross platform build-python should be {sysconfig.get_platform()}; "
+                f"got {output}"
             )
 
         # build-python is the same version as the local python
@@ -325,7 +330,8 @@ def verify(self):
         ).strip()
         if build_python_version != local_python_version:
             raise RuntimeError(
-                f"Cross platform build-python should be {local_python_version}; got {build_python_version}"
+                f"Cross platform build-python should be {local_python_version}; "
+                f"got {build_python_version}"
             )
 
         # cross-python returns the cross-platform host tag.
@@ -335,7 +341,8 @@ def verify(self):
         ).strip()
         if output != self.platform_identifier:
             raise RuntimeError(
-                f"Cross platform cross-python should be {self.platform_identifier}; got {output}"
+                f"Cross platform cross-python should be {self.platform_identifier}; "
+                f"got {output}"
             )
 
         # cross-python is the same version as the local python
@@ -345,7 +352,8 @@ def verify(self):
         ).strip()
         if cross_python_version != local_python_version:
             raise RuntimeError(
-                f"Cross platform python should be {local_python_version}; got {cross_python_version}"
+                f"Cross platform python should be {local_python_version}; "
+                f"got {cross_python_version}"
             )
 
     def cross_kwargs(self, kwargs):