diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 57bc455..7daf9e1 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -34,7 +34,7 @@ jobs:
       run: uv sync --all-extras --dev
 
     - name: Check styling
-      run: uv run flake8 --ignore=E123,E231,W291,W293 fimfarchive tests
+      run: uv run ruff check
 
     - name: Check types
       run: uv run mypy
diff --git a/fimfarchive/fetchers/fimfiction2.py b/fimfarchive/fetchers/fimfiction2.py
index 84c88d9..a86a65d 100644
--- a/fimfarchive/fetchers/fimfiction2.py
+++ b/fimfarchive/fetchers/fimfiction2.py
@@ -34,7 +34,7 @@ from jsonapi_client.document import Document
 from jsonapi_client.exceptions import DocumentError
 from jsonapi_client.resourceobject import ResourceObject
 
-from fimfarchive import __version__ as VERSION
+from fimfarchive import __version__ as version
 from fimfarchive.flavors import DataFormat, MetaFormat, MetaPurity, StorySource
 
 from fimfarchive.exceptions import (
@@ -164,7 +164,7 @@ class ApiClient:
         headers = {
             'Accept-Encoding': 'gzip, deflate',
             'Authorization': f'Bearer {token}',
-            'User-Agent': f'fimfarchive/{VERSION}',
+            'User-Agent': f'fimfarchive/{version}',
         }
 
         return Session(
diff --git a/pyproject.toml b/pyproject.toml
index fe6ed57..9654d96 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,10 +22,10 @@ lz4 = ["lz4~=4.3"]
 [tool.uv]
 compile-bytecode = true
 dev-dependencies = [
-    "flake8~=5.0",
     "mypy~=1.11",
     "pytest~=8.3",
     "requests-mock~=1.12",
+    "ruff~=0.6",
     "types-jmespath~=1.0",
     "types-requests~=2.32",
     "types-tqdm~=4.66",
@@ -45,6 +45,13 @@ venv = ".venv"
 [tool.pytest.ini_options]
 testpaths = ["tests"]
 
+[tool.ruff]
+extend-exclude = ["fimfarchive/__init__.py"]
+
+[tool.ruff.lint]
+select = ["A", "E", "F", "N", "RUF", "T10", "W"]
+ignore = ["N801", "RUF012"]
+
 [build-system]
 requires = ["hatchling"]
 build-backend = "hatchling.build"
diff --git a/tests/fetchers/test_directory.py b/tests/fetchers/test_directory.py
index d886f78..1470089 100644
--- a/tests/fetchers/test_directory.py
+++ b/tests/fetchers/test_directory.py
@@ -156,7 +156,7 @@ class TestDirectoryFetcher:
         """
         assert 3 == len(fetcher)
 
-    def test_len_caching(test, fetcher):
+    def test_len_caching(self, fetcher):
         """
         Tests len is only calculated once.
         """