diff --git a/redash/cli/data_sources.py b/redash/cli/data_sources.py
index 8049398659..4a94bfd12d 100644
--- a/redash/cli/data_sources.py
+++ b/redash/cli/data_sources.py
@@ -2,7 +2,6 @@
 
 import click
 from flask.cli import AppGroup
-from six import text_type
 from sqlalchemy.orm.exc import NoResultFound
 
 from redash import models
@@ -124,7 +123,7 @@ def new(name=None, type=None, options=None, organization="default"):
     schema = query_runner.configuration_schema()
 
     if options is None:
-        types = {"string": text_type, "number": int, "boolean": bool}
+        types = {"string": str, "number": int, "boolean": bool}
 
         options_obj = {}
 
diff --git a/redash/cli/users.py b/redash/cli/users.py
index af7ba99284..dacc05096d 100644
--- a/redash/cli/users.py
+++ b/redash/cli/users.py
@@ -2,7 +2,6 @@
 
 from click import BOOL, argument, option, prompt
 from flask.cli import AppGroup
-from six import string_types
 from sqlalchemy.orm.exc import NoResultFound
 from sqlalchemy.exc import IntegrityError
 
@@ -13,7 +12,7 @@
 
 
 def build_groups(org, groups, is_admin):
-    if isinstance(groups, string_types):
+    if isinstance(groups, str):
         groups = groups.split(",")
         groups.remove("")  # in case it was empty string
         groups = [int(g) for g in groups]
diff --git a/redash/handlers/data_sources.py b/redash/handlers/data_sources.py
index 4dee409696..05a3f2856b 100644
--- a/redash/handlers/data_sources.py
+++ b/redash/handlers/data_sources.py
@@ -3,7 +3,6 @@
 from flask import make_response, request
 from flask_restful import abort
 from funcy import project
-from six import text_type
 from sqlalchemy.exc import IntegrityError
 
 from redash import models
@@ -254,7 +253,7 @@ def post(self, data_source_id):
         try:
             data_source.query_runner.test_connection()
         except Exception as e:
-            response = {"message": text_type(e), "ok": False}
+            response = {"message": str(e), "ok": False}
         else:
             response = {"message": "success", "ok": True}
 
diff --git a/redash/models/__init__.py b/redash/models/__init__.py
index 3022b98e0a..dd69fe8f6f 100644
--- a/redash/models/__init__.py
+++ b/redash/models/__init__.py
@@ -5,7 +5,6 @@
 import numbers
 import pytz
 
-from six import text_type
 from sqlalchemy import distinct, or_, and_, UniqueConstraint
 from sqlalchemy.dialects import postgresql
 from sqlalchemy.event import listens_for
@@ -143,7 +142,7 @@ def to_dict(self, all=False, with_permissions_for=None):
         return d
 
     def __str__(self):
-        return text_type(self.name)
+        return str(self.name)
 
     @classmethod
     def create_with_group(cls, *args, **kwargs):
@@ -486,7 +485,7 @@ class Query(ChangeTrackingMixin, TimestampMixin, BelongsToOrgMixin, db.Model):
     __mapper_args__ = {"version_id_col": version, "version_id_generator": False}
 
     def __str__(self):
-        return text_type(self.id)
+        return str(self.id)
 
     def archive(self, user=None):
         db.session.add(self)
@@ -866,7 +865,7 @@ def are_favorites(cls, user, objects):
         if not objects:
             return []
 
-        object_type = text_type(objects[0].__class__.__name__)
+        object_type = str(objects[0].__class__.__name__)
         return [
             fav.object_id
             for fav in cls.query.filter(
@@ -1305,7 +1304,7 @@ class NotificationDestination(BelongsToOrgMixin, db.Model):
     )
 
     def __str__(self):
-        return text_type(self.name)
+        return str(self.name)
 
     def to_dict(self, all=False):
         d = {
diff --git a/redash/models/parameterized_query.py b/redash/models/parameterized_query.py
index 85225e0414..0094c0aa7d 100644
--- a/redash/models/parameterized_query.py
+++ b/redash/models/parameterized_query.py
@@ -6,15 +6,13 @@
 from funcy import distinct
 from dateutil.parser import parse
 
-from six import string_types, text_type
-
 
 def _pluck_name_and_value(default_column, row):
     row = {k.lower(): v for k, v in row.items()}
     name_column = "name" if "name" in row.keys() else default_column.lower()
     value_column = "value" if "value" in row.keys() else default_column.lower()
 
-    return {"name": row[name_column], "value": text_type(row[value_column])}
+    return {"name": row[name_column], "value": str(row[value_column])}
 
 
 def _load_result(query_id, org):
@@ -115,8 +113,8 @@ def _is_date_range(obj):
 
 def _is_value_within_options(value, dropdown_options, allow_list=False):
     if isinstance(value, list):
-        return allow_list and set(map(text_type, value)).issubset(set(dropdown_options))
-    return text_type(value) in dropdown_options
+        return allow_list and set(map(str, value)).issubset(set(dropdown_options))
+    return str(value) in dropdown_options
 
 
 class ParameterizedQuery(object):
@@ -157,11 +155,11 @@ def _valid(self, name, value):
         query_id = definition.get("queryId")
         allow_multiple_values = isinstance(definition.get("multiValuesOptions"), dict)
 
-        if isinstance(enum_options, string_types):
+        if isinstance(enum_options, str):
             enum_options = enum_options.split("\n")
 
         validators = {
-            "text": lambda value: isinstance(value, string_types),
+            "text": lambda value: isinstance(value, str),
             "number": _is_number,
             "enum": lambda value: _is_value_within_options(
                 value, enum_options, allow_multiple_values
diff --git a/redash/models/users.py b/redash/models/users.py
index 6be4882915..00325f4b0b 100644
--- a/redash/models/users.py
+++ b/redash/models/users.py
@@ -8,7 +8,6 @@
 from flask import current_app as app, url_for, request_started
 from flask_login import current_user, AnonymousUserMixin, UserMixin
 from passlib.apps import custom_app_context as pwd_context
-from six import string_types, text_type
 from sqlalchemy.exc import DBAPIError
 from sqlalchemy.dialects import postgresql
 
@@ -290,7 +289,7 @@ class Group(db.Model, BelongsToOrgMixin):
     __tablename__ = "groups"
 
     def __str__(self):
-        return text_type(self.id)
+        return str(self.id)
 
     def to_dict(self):
         return {
@@ -405,7 +404,7 @@ def is_api_user(self):
 class ApiUser(UserMixin, PermissionsCheckMixin):
     def __init__(self, api_key, org, groups, name=None):
         self.object = None
-        if isinstance(api_key, string_types):
+        if isinstance(api_key, str):
             self.id = api_key
             self.name = name
         else:
diff --git a/redash/query_runner/__init__.py b/redash/query_runner/__init__.py
index 061b325144..993f56c38d 100644
--- a/redash/query_runner/__init__.py
+++ b/redash/query_runner/__init__.py
@@ -3,8 +3,6 @@
 from dateutil import parser
 import requests
 
-from six import text_type
-
 from redash import settings
 from redash.utils import json_loads
 
@@ -292,7 +290,7 @@ def guess_type_from_string(string_value):
     except (ValueError, OverflowError):
         pass
 
-    if text_type(string_value).lower() in ("true", "false"):
+    if str(string_value).lower() in ("true", "false"):
         return TYPE_BOOLEAN
 
     try:
diff --git a/redash/query_runner/couchbase.py b/redash/query_runner/couchbase.py
index 4e1de63fd4..ec1740aac6 100644
--- a/redash/query_runner/couchbase.py
+++ b/redash/query_runner/couchbase.py
@@ -2,7 +2,6 @@
 import logging
 
 from dateutil.parser import parse
-from six import text_type
 
 from redash.query_runner import *
 from redash.utils import JSONEncoder, json_dumps, json_loads, parse_human_time
@@ -18,7 +17,7 @@
 
 TYPES_MAP = {
     str: TYPE_STRING,
-    text_type: TYPE_STRING,
+    bytes: TYPE_STRING,
     int: TYPE_INTEGER,
     float: TYPE_FLOAT,
     bool: TYPE_BOOLEAN,
diff --git a/redash/query_runner/drill.py b/redash/query_runner/drill.py
index d3b754374d..9111b2002d 100644
--- a/redash/query_runner/drill.py
+++ b/redash/query_runner/drill.py
@@ -4,8 +4,6 @@
 
 from dateutil import parser
 
-from six import text_type
-
 from redash.query_runner import (
     BaseHTTPQueryRunner,
     register,
@@ -32,12 +30,12 @@ def convert_type(string_value, actual_type):
         return float(string_value)
 
     if actual_type == TYPE_BOOLEAN:
-        return text_type(string_value).lower() == "true"
+        return str(string_value).lower() == "true"
 
     if actual_type == TYPE_DATETIME:
         return parser.parse(string_value)
 
-    return text_type(string_value)
+    return str(string_value)
 
 
 # Parse Drill API response and translate it to accepted format
diff --git a/redash/query_runner/elasticsearch.py b/redash/query_runner/elasticsearch.py
index 04ec193049..6c26bcc211 100644
--- a/redash/query_runner/elasticsearch.py
+++ b/redash/query_runner/elasticsearch.py
@@ -6,7 +6,6 @@
 
 import requests
 from requests.auth import HTTPBasicAuth
-from six import string_types, text_type
 
 from redash.query_runner import *
 from redash.utils import json_dumps, json_loads
@@ -35,7 +34,7 @@
 
 PYTHON_TYPES_MAPPING = {
     str: TYPE_STRING,
-    text_type: TYPE_STRING,
+    bytes: TYPE_STRING,
     bool: TYPE_BOOLEAN,
     int: TYPE_INTEGER,
     float: TYPE_FLOAT,
@@ -417,7 +416,7 @@ def run_query(self, query, user):
 
             result_columns = []
             result_rows = []
-            if isinstance(query_data, string_types):
+            if isinstance(query_data, str):
                 _from = 0
                 while True:
                     query_size = size if limit >= (_from + size) else (limit - _from)
diff --git a/redash/query_runner/json_ds.py b/redash/query_runner/json_ds.py
index 2a9cba3508..9b6095ba51 100644
--- a/redash/query_runner/json_ds.py
+++ b/redash/query_runner/json_ds.py
@@ -5,7 +5,6 @@
 import datetime
 from urllib.parse import urlparse
 from funcy import compact, project
-from six import text_type
 from redash.utils import json_dumps
 from redash.query_runner import (
     BaseHTTPQueryRunner,
@@ -32,19 +31,19 @@ def parse_query(query):
         return params
     except ValueError as e:
         logging.exception(e)
-        error = text_type(e)
+        error = str(e)
         raise QueryParseError(error)
 
 
 def is_private_address(url):
     hostname = urlparse(url).hostname
     ip_address = socket.gethostbyname(hostname)
-    return ipaddress.ip_address(text_type(ip_address)).is_private
+    return ipaddress.ip_address(str(ip_address)).is_private
 
 
 TYPES_MAP = {
     str: TYPE_STRING,
-    text_type: TYPE_STRING,
+    bytes: TYPE_STRING,
     int: TYPE_INTEGER,
     float: TYPE_FLOAT,
     bool: TYPE_BOOLEAN,
diff --git a/redash/query_runner/mongodb.py b/redash/query_runner/mongodb.py
index 6da92620e6..0639b02808 100644
--- a/redash/query_runner/mongodb.py
+++ b/redash/query_runner/mongodb.py
@@ -3,7 +3,6 @@
 import re
 
 from dateutil.parser import parse
-from six import string_types, text_type
 
 from redash.query_runner import *
 from redash.utils import JSONEncoder, json_dumps, json_loads, parse_human_time
@@ -26,7 +25,7 @@
 
 TYPES_MAP = {
     str: TYPE_STRING,
-    text_type: TYPE_STRING,
+    bytes: TYPE_STRING,
     int: TYPE_INTEGER,
     float: TYPE_FLOAT,
     bool: TYPE_BOOLEAN,
@@ -57,7 +56,7 @@ def parse_oids(oids):
 
 def datetime_parser(dct):
     for k, v in dct.items():
-        if isinstance(v, string_types):
+        if isinstance(v, str):
             m = date_regex.findall(v)
             if len(m) > 0:
                 dct[k] = parse(m[0], yearfirst=True)
diff --git a/redash/tasks/queries/execution.py b/redash/tasks/queries/execution.py
index a725bf5ae8..a3f6f361ba 100644
--- a/redash/tasks/queries/execution.py
+++ b/redash/tasks/queries/execution.py
@@ -2,7 +2,6 @@
 import signal
 import time
 import redis
-from six import text_type
 
 from rq import get_current_job
 from rq.job import JobStatus
@@ -162,7 +161,7 @@ def run(self):
             if isinstance(e, JobTimeoutException):
                 error = TIMEOUT_MESSAGE
             else:
-                error = text_type(e)
+                error = str(e)
 
             data = None
             logging.warning("Unexpected error while running query:", exc_info=1)
diff --git a/redash/utils/__init__.py b/redash/utils/__init__.py
index 94f570f625..73a17d05e5 100644
--- a/redash/utils/__init__.py
+++ b/redash/utils/__init__.py
@@ -10,8 +10,6 @@
 import uuid
 import binascii
 
-from six import string_types
-
 import pystache
 import pytz
 import simplejson
@@ -148,7 +146,7 @@ def __init__(self, f, dialect=csv.excel, encoding=WRITER_ENCODING, **kwds):
         self.encoder = codecs.getincrementalencoder(encoding)()
 
     def _encode_utf8(self, val):
-        if isinstance(val, string_types):
+        if isinstance(val, str):
             return val.encode(WRITER_ENCODING, WRITER_ERRORS)
 
         return val
diff --git a/requirements.txt b/requirements.txt
index f9cf390747..e76671b9e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,6 @@ pytz>=2019.3
 PyYAML==5.1.2
 redis==3.3.11
 requests==2.22.0
-six==1.12.0
 SQLAlchemy==1.3.10
 # We can't upgrade SQLAlchemy-Searchable version as newer versions require PostgreSQL > 9.6, but we target older versions at the moment.
 SQLAlchemy-Searchable==0.10.6
diff --git a/tests/test_authentication.py b/tests/test_authentication.py
index 52fc173ff5..91be52ea76 100644
--- a/tests/test_authentication.py
+++ b/tests/test_authentication.py
@@ -1,8 +1,7 @@
+import importlib
 import os
 import time
 
-from six.moves import reload_module
-
 from flask import request
 from mock import patch
 from redash import models, settings
@@ -328,11 +327,11 @@ def override_settings(self, overrides):
         variables = self.DEFAULT_SETTING_OVERRIDES.copy()
         variables.update(overrides or {})
         with patch.dict(os.environ, variables):
-            reload_module(settings)
+            importlib.reload(settings)
 
         # Queue a cleanup routine that reloads the settings without overrides
         # once the test ends
-        self.addCleanup(lambda: reload_module(settings))
+        self.addCleanup(lambda: importlib.reload(settings))
 
     def assert_correct_user_attributes(
         self,