5 files changed, 7 insertions, 7 deletions
diff --git a/contrib/devtools/circular-dependencies.py b/contrib/devtools/circular-dependencies.py
index d544d5c371..abfa5ed5ae 100755
--- a/contrib/devtools/circular-dependencies.py
+++ b/contrib/devtools/circular-dependencies.py
@@ -37,7 +37,7 @@ for arg in sys.argv[1:]:
 # TODO: implement support for multiple include directories
 for arg in sorted(files.keys()):
     module = files[arg]
-    with open(arg, 'r') as f:
+    with open(arg, 'r', encoding="utf8") as f:
         for line in f:
             match = RE.match(line)
             if match:
diff --git a/contrib/devtools/clang-format-diff.py b/contrib/devtools/clang-format-diff.py
index 5402870fba..77e845a9b4 100755
--- a/contrib/devtools/clang-format-diff.py
+++ b/contrib/devtools/clang-format-diff.py
@@ -152,7 +152,7 @@ def main():
       sys.exit(p.returncode)
 
     if not args.i:
-      with open(filename) as f:
+      with open(filename, encoding="utf8") as f:
         code = f.readlines()
       formatted_code = io.StringIO(stdout).readlines()
       diff = difflib.unified_diff(code, formatted_code,
diff --git a/contrib/devtools/copyright_header.py b/contrib/devtools/copyright_header.py
index 82d3c19683..da7d74bdc4 100755
--- a/contrib/devtools/copyright_header.py
+++ b/contrib/devtools/copyright_header.py
@@ -146,7 +146,7 @@ def file_has_without_c_style_copyright_for_holder(contents, holder_name):
 ################################################################################
 
 def read_file(filename):
-    return open(os.path.abspath(filename), 'r').read()
+    return open(os.path.abspath(filename), 'r', encoding="utf8").read()
 
 def gather_file_info(filename):
     info = {}
@@ -325,13 +325,13 @@ def get_most_recent_git_change_year(filename):
 ################################################################################
 
 def read_file_lines(filename):
-    f = open(os.path.abspath(filename), 'r')
+    f = open(os.path.abspath(filename), 'r', encoding="utf8")
     file_lines = f.readlines()
     f.close()
     return file_lines
 
 def write_file_lines(filename, file_lines):
-    f = open(os.path.abspath(filename), 'w')
+    f = open(os.path.abspath(filename), 'w', encoding="utf8")
     f.write(''.join(file_lines))
     f.close()
 
diff --git a/contrib/devtools/github-merge.py b/contrib/devtools/github-merge.py
index 187ef75fb7..4e90f85f50 100755
--- a/contrib/devtools/github-merge.py
+++ b/contrib/devtools/github-merge.py
@@ -191,7 +191,7 @@ def main():
     merge_branch = 'pull/'+pull+'/merge'
     local_merge_branch = 'pull/'+pull+'/local-merge'
 
-    devnull = open(os.devnull,'w')
+    devnull = open(os.devnull, 'w', encoding="utf8")
     try:
         subprocess.check_call([GIT,'checkout','-q',branch])
     except subprocess.CalledProcessError:
diff --git a/contrib/devtools/test-security-check.py b/contrib/devtools/test-security-check.py
index 307e057736..9b6d6bf665 100755
--- a/contrib/devtools/test-security-check.py
+++ b/contrib/devtools/test-security-check.py
@@ -9,7 +9,7 @@ import subprocess
 import unittest
 
 def write_testcode(filename):
-    with open(filename, 'w') as f:
+    with open(filename, 'w', encoding="utf8") as f:
         f.write('''
     #include <stdio.h>
     int main()