diff --git a/tools/cpplint.py b/tools/cpplint.py
index b4a4586caaf80c..06fc45abf1a0eb 100755
--- a/tools/cpplint.py
+++ b/tools/cpplint.py
@@ -41,6 +41,11 @@
 same line, but it is far from perfect (in either direction).
 """
 
+# cpplint predates fstrings
+# pylint: disable=consider-using-f-string
+
+# pylint: disable=invalid-name
+
 import codecs
 import copy
 import getopt
@@ -59,7 +64,7 @@
 # if empty, use defaults
 _valid_extensions = set([])
 
-__VERSION__ = '1.5.5'
+__VERSION__ = '1.6.0'
 
 try:
   xrange          # Python 2
@@ -1928,6 +1933,7 @@ def __init__(self, lines):
     self.raw_lines = lines
     self.num_lines = len(lines)
     self.lines_without_raw_strings = CleanseRawStrings(lines)
+    # # pylint: disable=consider-using-enumerate
     for linenum in range(len(self.lines_without_raw_strings)):
       self.lines.append(CleanseComments(
           self.lines_without_raw_strings[linenum]))
@@ -5164,10 +5170,12 @@ def CheckIncludeLine(filename, clean_lines, linenum, include_state, error):
   #
   # We also make an exception for Lua headers, which follow google
   # naming convention but not the include convention.
-  match = Match(r'#include\s*"([^/]+\.h)"', line)
-  if match and not _THIRD_PARTY_HEADERS_PATTERN.match(match.group(1)):
-    error(filename, linenum, 'build/include_subdir', 4,
-          'Include the directory when naming .h files')
+  match = Match(r'#include\s*"([^/]+\.(.*))"', line)
+  if match:
+    if (IsHeaderExtension(match.group(2)) and
+        not _THIRD_PARTY_HEADERS_PATTERN.match(match.group(1))):
+      error(filename, linenum, 'build/include_subdir', 4,
+            'Include the directory when naming header files')
 
   # we shouldn't include a file more than once. actually, there are a
   # handful of instances where doing so is okay, but in general it's
@@ -6620,7 +6628,7 @@ def ProcessConfigOverrides(filename):
       continue
 
     try:
-      with open(cfg_file) as file_handle:
+      with open(cfg_file, encoding='utf-8') as file_handle:
         for line in file_handle:
           line, _, _ = line.partition('#')  # Remove comments.
           if not line.strip():