diff --git a/scripts/setup/generate_secrets.py b/scripts/setup/generate_secrets.py
index 95b92eff24..e22d5609be 100755
--- a/scripts/setup/generate_secrets.py
+++ b/scripts/setup/generate_secrets.py
@@ -14,9 +14,9 @@ import scripts.lib.setup_path_on_import
 os.environ['DJANGO_SETTINGS_MODULE'] = 'zproject.settings'
 
 from django.utils.crypto import get_random_string
-import six
 import argparse
 import uuid
+import configparser
 from zerver.lib.str_utils import force_str
 from zerver.lib.utils import generate_random_token
 
@@ -56,7 +56,7 @@ def get_old_conf(output_filename):
     if not os.path.exists(output_filename):
         return {}
 
-    secrets_file = six.moves.configparser.RawConfigParser()
+    secrets_file = configparser.RawConfigParser()
     secrets_file.read(output_filename)
 
     return dict(secrets_file.items("secrets"))
diff --git a/tools/minify-js b/tools/minify-js
index e4fb070104..7d2f27e225 100755
--- a/tools/minify-js
+++ b/tools/minify-js
@@ -9,7 +9,6 @@ import os
 import subprocess
 import argparse
 import sys
-import six
 
 parser = argparse.ArgumentParser()
 parser.add_argument('--prev-deploy', metavar='DIR',
@@ -102,7 +101,7 @@ MIN_DIR = os.path.join(STATIC_PATH, 'min/')
 MAP_DIR = os.path.join(STATIC_PATH, 'source-map/')
 subprocess.check_call(['mkdir', '-p', MIN_DIR, MAP_DIR])
 
-for js_group_filespec_pair in six.iteritems(JS_SPECS):
+for js_group_filespec_pair in JS_SPECS.items():
     # JS_SPECS is not typed, so forcefully type keys and values being read from JS_SPECS
     js_group = js_group_filespec_pair[0]  # type: str
     filespec = js_group_filespec_pair[1]  # type: Dict[str, Any]
diff --git a/tools/replace-tarball-shebang b/tools/replace-tarball-shebang
index c20e645896..ea6b77151e 100755
--- a/tools/replace-tarball-shebang
+++ b/tools/replace-tarball-shebang
@@ -2,7 +2,7 @@
 
 from __future__ import print_function
 
-import six
+import io
 import sys
 import tarfile
 
@@ -29,6 +29,6 @@ with tarfile.open(fileobj=stdin, mode='r|*') as in_tar, \
                 assert info.size == len(data)
                 data = new_shebang_bytes + data[len(old_shebang_bytes):]
                 info.size = len(data)
-            out_tar.addfile(info, six.BytesIO(data))
+            out_tar.addfile(info, io.BytesIO(data))
         else:
             out_tar.addfile(info)
diff --git a/tools/run-mypy b/tools/run-mypy
index c9fc2238cf..54f4fb1302 100755
--- a/tools/run-mypy
+++ b/tools/run-mypy
@@ -7,7 +7,6 @@ import os
 import sys
 import argparse
 import subprocess
-import six
 
 import lister
 from typing import cast, Dict, List
diff --git a/zproject/settings.py b/zproject/settings.py
index 3328fce5e2..91906df068 100644
--- a/zproject/settings.py
+++ b/zproject/settings.py
@@ -20,7 +20,6 @@ import six.moves.configparser
 
 from zerver.lib.db import TimeTrackingConnection
 import zerver.lib.logging_util
-import six
 
 ########################################################################
 # INITIAL SETTINGS
@@ -219,7 +218,7 @@ DEFAULT_SETTINGS = {'TWITTER_CONSUMER_KEY': '',
                     'PUSH_NOTIFICATION_BOUNCER_URL': None,
                     }
 
-for setting_name, setting_val in six.iteritems(DEFAULT_SETTINGS):
+for setting_name, setting_val in DEFAULT_SETTINGS.items():
     if setting_name not in vars():
         vars()[setting_name] = setting_val