diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3e4c0f20..45ee42ad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,7 +51,7 @@ jobs:
       - name: Install poetry
         run: pip install poetry
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           cache: 'poetry'
           cache-dependency-path: "tests/pyproject.toml"
@@ -77,7 +77,7 @@ jobs:
       - name: Install poetry
         run: pip install poetry
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: '3.12'
           cache: 'poetry'
diff --git a/scripts/checkstyle.py b/scripts/checkstyle.py
index 6e2d3dd3..75a2911b 100755
--- a/scripts/checkstyle.py
+++ b/scripts/checkstyle.py
@@ -1,9 +1,11 @@
 #!/usr/bin/env python3
-import re
-import os
 import argparse
+import os
+import re
+import sys
+from collections.abc import Callable  # Compatibility.
 from pathlib import Path
-from typing import Callable, List, Dict, Any # compat
+from typing import Any
 
 # This file checks Bash and Shell scripts for violations not found with
 # shellcheck or existing methods. You can use it in several ways:
@@ -21,7 +23,7 @@
 # Check to ensure all regular expressions are working as intended:
 # $ ./scripts/checkstyle.py --internal-test-regex
 
-Rule = Dict[str, Any]
+Rule = dict[str, Any]
 
 class c:
     RED = '\033[91m'
@@ -91,7 +93,7 @@ def noVerboseRedirectionFixer(line: str, m: Any) -> str:
 
     return f'{prestr}&>/dev/null{poststr}'
 
-def lintfile(file: Path, rules: List[Rule], options: Dict[str, Any]):
+def lintfile(file: Path, rules: list[Rule], options: dict[str, Any]):
     content_arr = file.read_text().split('\n')
 
     for line_i, line in enumerate(content_arr):
@@ -100,6 +102,7 @@ def lintfile(file: Path, rules: List[Rule], options: Dict[str, Any]):
 
         for rule in rules:
             should_run = False
+            # ruff: noqa: SIM102
             if 'sh' in rule['fileTypes']:
                 if file.name.endswith('.sh'):
                     should_run = True
@@ -108,7 +111,7 @@ def lintfile(file: Path, rules: List[Rule], options: Dict[str, Any]):
                     should_run = True
 
             if options['verbose']:
-                print(f'{str(file)}: {should_run}')
+                print(f'{file!s}: {should_run}')
 
             if not should_run:
                 continue
@@ -134,7 +137,7 @@ def lintfile(file: Path, rules: List[Rule], options: Dict[str, Any]):
         file.write_text('\n'.join(content_arr))
 
 def main():
-    rules: List[Rule] = [
+    rules: list[Rule] = [
         {
             'name': 'no-pwd-capture',
             'regex': '(?P<match>\\$\\(pwd\\))',
@@ -255,8 +258,8 @@ def main():
 
     # exit
     if grand_total == 0:
-        exit(0)
+        sys.exit(0)
     else:
-        exit(2)
+        sys.exit(2)
 
 main()