diff --git a/pre_commit_hooks/check_json.py b/pre_commit_hooks/check_json.py
index 51e0f21c..ef4629a2 100644
--- a/pre_commit_hooks/check_json.py
+++ b/pre_commit_hooks/check_json.py
@@ -3,7 +3,8 @@
 import argparse
 import json
 import re
-from typing import Any, Sequence
+from typing import Any
+from typing import Sequence
 
 
 def raise_duplicate_keys(
@@ -17,6 +18,7 @@ def raise_duplicate_keys(
             d[key] = val
     return d
 
+
 def check_mixed_indentation(content: str, filename: str) -> bool:
     """
     Checks a string content for mixed indentation (tabs and spaces) in leading whitespace.
@@ -41,6 +43,7 @@ def check_mixed_indentation(content: str, filename: str) -> bool:
 
     return not found_mixed
 
+
 def main(argv: Sequence[str] | None = None) -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument('filenames', nargs='*', help='Filenames to check.')
@@ -48,7 +51,7 @@ def main(argv: Sequence[str] | None = None) -> int:
 
     retval = 0
     for filename in args.filenames:
-        with open(filename, 'r') as f:
+        with open(filename) as f:
             content = f.read()
 
         # Check for mixed indentation first