diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d8720d768a..16762765c2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -21,6 +21,7 @@ jobs:
     - uses: astral-sh/ruff-action@v3
       with:
         args: "check --select=E,F,PLC,PLE,UP,W,YTT --ignore=E721,PLC0206,PLC0415,PLC1901,S101,UP031 --target-version=py39"
+    - run: ruff format --check --diff
 
   lint-js:
     name: Lint JS
diff --git a/test/fixtures/test-charmap.py b/test/fixtures/test-charmap.py
index 63aa77bb48..9f601af4ab 100644
--- a/test/fixtures/test-charmap.py
+++ b/test/fixtures/test-charmap.py
@@ -19,7 +19,7 @@ def main():
 
     textmap = {
         "cp936": "\u4e2d\u6587",
-        "cp1252": "Lat\u012Bna",
+        "cp1252": "Lat\u012bna",
         "cp932": "\u306b\u307b\u3093\u3054",
     }
     if encoding in textmap:
diff --git a/update-gyp.py b/update-gyp.py
index c65da41472..a822c0485f 100755
--- a/update-gyp.py
+++ b/update-gyp.py
@@ -13,10 +13,9 @@
 CHECKOUT_GYP_PATH = os.path.join(CHECKOUT_PATH, "gyp")
 
 parser = argparse.ArgumentParser()
-parser.add_argument("--no-commit",
-    action="store_true",
-    dest="no_commit",
-    help="do not run git-commit")
+parser.add_argument(
+    "--no-commit", action="store_true", dest="no_commit", help="do not run git-commit"
+)
 parser.add_argument("tag", help="gyp tag to update to")
 args = parser.parse_args()
 
@@ -37,8 +36,8 @@
 
         print("Unzipping...")
         with tarfile.open(tar_file, "r:gz") as tar_ref:
-            def is_within_directory(directory, target):
 
+            def is_within_directory(directory, target):
                 abs_directory = os.path.abspath(directory)
                 abs_target = os.path.abspath(target)
 
@@ -47,7 +46,6 @@ def is_within_directory(directory, target):
                 return prefix == abs_directory
 
             def safe_extract(tar, path=".", members=None, *, numeric_owner=False):
-
                 for member in tar.getmembers():
                     member_path = os.path.join(path, member.name)
                     if not is_within_directory(path, member_path):
@@ -65,7 +63,7 @@ def safe_extract(tar, path=".", members=None, *, numeric_owner=False):
         )
 
 if not args.no_commit:
-  subprocess.check_output(["git", "add", "gyp"], cwd=CHECKOUT_PATH)
-  subprocess.check_output([
-    "git", "commit", "-m", f"feat(gyp): update gyp to {args.tag}"
-  ])
+    subprocess.check_output(["git", "add", "gyp"], cwd=CHECKOUT_PATH)
+    subprocess.check_output(
+        ["git", "commit", "-m", f"feat(gyp): update gyp to {args.tag}"]
+    )