diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index b8697ef..2dda037 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -9,12 +9,17 @@
 			"extensions": [
 				"GitHub.vscode-github-actions",
 				"ms-python.python",
-				"nefrob.vscode-just-syntax"
+				"nefrob.vscode-just-syntax",
+				"omnilib.ufmt"
 			],
 			"settings": {
 				"python.analysis.include": [
 					"python/**"
 				],
+				"python.defaultInterpreterPath": ".venv/bin/python3",
+				"python.editor.defaultFormatter": "omnilib.ufmt",
+				"python.editor.formatOnSave": true,
+				"python.terminal.activateEnvInCurrentTerminal": true,
 				"rust-analyzer.linkedProjects": [
 					"./Cargo.toml"
 				]
@@ -31,5 +36,8 @@
 		"ghcr.io/devcontainers/features/rust:1": {},
 		"ghcr.io/devcontainers-extra/features/devcontainers-cli:1": {},
 		"ghcr.io/guiyomh/features/just:0": {}
+	},
+	"postCreateCommand": {
+		"installPythonDependencies": "cd /workspaces/dotslash/python && uv venv --no-project && uv pip install -r requirements-fmt.txt"
 	}
 }
diff --git a/.gitignore b/.gitignore
index 93b7dfd..ecd9fd3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,7 @@
 
 # Python
 __pycache__/
-/python/.ruff_cache/
+.venv/
 *.pyc
 
 # Node.js
diff --git a/Justfile b/Justfile
index 9f4ed0a..d118356 100644
--- a/Justfile
+++ b/Justfile
@@ -52,15 +52,14 @@ test-feature-scenarios:
 [group('Downstream')]
 [working-directory: 'python']
 check-python:
-  uvx ruff check
-  uvx ruff format --check --diff
+  uv run --no-project --with-requirements requirements-fmt.txt -- ufmt diff src tests
+  uv run --no-project --with-requirements requirements-fmt.txt -- ufmt check src tests
 
 # Fix static analysis issues for the Python package.
 [group('Downstream')]
 [working-directory: 'python']
 fix-python:
-  uvx ruff check --fix
-  uvx ruff format
+  uv run --no-project --with-requirements requirements-fmt.txt -- ufmt format src tests
 
 # Test the Python package.
 [group('Downstream')]
diff --git a/python/hatch_build.py b/python/hatch_build.py
index 3657451..3b3e95f 100644
--- a/python/hatch_build.py
+++ b/python/hatch_build.py
@@ -12,7 +12,7 @@
 from contextlib import contextmanager
 from functools import cached_property
 from platform import machine
-from typing import TYPE_CHECKING, Any, BinaryIO
+from typing import Any, BinaryIO, TYPE_CHECKING
 
 from hatchling.builders.hooks.plugin.interface import BuildHookInterface
 from hatchling.metadata.plugin.interface import MetadataHookInterface
@@ -34,7 +34,9 @@ def update(self, metadata: dict[str, Any]) -> None:
                 "Accept": "application/vnd.github+json",
                 "X-GitHub-Api-Version": "2022-11-28",
             }
-            if github_token := (os.environ.get("GH_TOKEN") or os.environ.get("GITHUB_TOKEN")):
+            if github_token := (
+                os.environ.get("GH_TOKEN") or os.environ.get("GITHUB_TOKEN")
+            ):
                 headers["Authorization"] = f"Bearer {github_token}"
 
             with http_get(
@@ -49,12 +51,16 @@ def update(self, metadata: dict[str, Any]) -> None:
 
 
 class CustomBuildHook(BuildHookInterface):
-    def initialize(self, version: str, build_data: dict[str, Any]) -> None:  # noqa: ARG002
+    def initialize(
+        self, version: str, build_data: dict[str, Any]
+    ) -> None:  # noqa: ARG002
         if self.__source == "release":
             asset = self.__release_asset
         elif os.path.isdir(self.__source):
             asset = self.__local_asset
-        elif not os.path.isabs(self.__source) and os.path.isfile(os.path.join(self.root, "PKG-INFO")):
+        elif not os.path.isabs(self.__source) and os.path.isfile(
+            os.path.join(self.root, "PKG-INFO")
+        ):
             msg = (
                 "The current directory has a `PKG-INFO` file, which likely means that the wheel is being "
                 "built from an unpacked source distribution. You must do one of the following:\n"
@@ -79,7 +85,9 @@ def initialize(self, version: str, build_data: dict[str, Any]) -> None:  # noqa:
         build_data["shared_scripts"][self.__binary_path] = self.__binary_name
         build_data["tag"] = f"py3-none-{self.__wheel_arch}"
 
-    def finalize(self, version: str, build_data: dict[str, Any], artifact: str) -> None:  # noqa: ARG002
+    def finalize(
+        self, version: str, build_data: dict[str, Any], artifact: str
+    ) -> None:  # noqa: ARG002
         import shutil
 
         shutil.rmtree(self.__temp_dir)
@@ -121,9 +129,15 @@ def __arch(self) -> str:
     def __target_data(self) -> tuple[str, str]:
         match self.__platform, self.__arch:
             case "linux", "aarch64":
-                return "dotslash-linux-musl.aarch64.tar.gz", self.__get_linux_wheel_arch()
+                return (
+                    "dotslash-linux-musl.aarch64.tar.gz",
+                    self.__get_linux_wheel_arch(),
+                )
             case "linux", "x86_64":
-                return "dotslash-linux-musl.x86_64.tar.gz", self.__get_linux_wheel_arch()
+                return (
+                    "dotslash-linux-musl.x86_64.tar.gz",
+                    self.__get_linux_wheel_arch(),
+                )
             case "windows", "arm64":
                 return "dotslash-windows-arm64.tar.gz", "win_arm64"
             case "windows", "amd64":
@@ -146,7 +160,9 @@ def __wheel_arch(self) -> str:
 
     @cached_property
     def __source(self) -> str:
-        return os.environ.get("DOTSLASH_SOURCE") or self.config.get("source") or "release"
+        return (
+            os.environ.get("DOTSLASH_SOURCE") or self.config.get("source") or "release"
+        )
 
     @cached_property
     def __temp_dir(self) -> str:
diff --git a/python/pyproject.toml b/python/pyproject.toml
index e6ccd10..4bb17ff 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -69,3 +69,13 @@ repair-wheel-command = ""
 
 [tool.cibuildwheel.linux]
 environment-pass = ["DOTSLASH_SOURCE", "DOTSLASH_VERSION"]
+
+[tool.black]
+target-version = ["py310"]
+
+[tool.usort]
+first_party_detection = false
+
+[tool.ufmt]
+formatter = "ruff-api"
+sorter = "ruff-api"
diff --git a/python/requirements-fmt.txt b/python/requirements-fmt.txt
new file mode 100644
index 0000000..676e63e
--- /dev/null
+++ b/python/requirements-fmt.txt
@@ -0,0 +1,7 @@
+# generated by `pyfmt --requirements`
+black==24.4.2
+ruff-api==0.1.0
+stdlibs==2024.1.28
+ufmt==2.8.0
+usort==1.0.8.post1
+
diff --git a/python/ruff.toml b/python/ruff.toml
deleted file mode 100644
index acf3b6b..0000000
--- a/python/ruff.toml
+++ /dev/null
@@ -1,7 +0,0 @@
-line-length = 120
-
-[lint.flake8-tidy-imports]
-ban-relative-imports = "all"
-
-[lint.isort]
-known-first-party = ["dotslash"]
diff --git a/python/tests/test_cli.py b/python/tests/test_cli.py
index 02eb4b4..dd2f4fe 100644
--- a/python/tests/test_cli.py
+++ b/python/tests/test_cli.py
@@ -13,7 +13,11 @@
 
 
 def test_cli() -> None:
-    result = subprocess.run([sys.executable, "-m", "dotslash", "--version"], capture_output=True, encoding="utf-8")
+    result = subprocess.run(
+        [sys.executable, "-m", "dotslash", "--version"],
+        capture_output=True,
+        encoding="utf-8",
+    )
     output = result.stdout.strip()
     assert result.returncode == 0, output