diff --git a/.gitignore b/.gitignore
index 7dbdb7b..efe2784 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,7 +37,6 @@ pip-delete-this-directory.txt
 
 # Unit test / coverage reports
 htmlcov/
-.tox/
 .coverage
 .coverage.*
 .cache
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index bf26239..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-# Config file for automatic testing at travis-ci.org
-
-language: python
-python:
-  - 3.8
-  - 3.7
-
-# Command to install dependencies, e.g. pip install -r requirements_dev.txt --use-mirrors
-install: pip install -U tox-travis
-
-# Command to run tests, e.g. python setup.py test
-script: tox
-
-
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 6deeacf..436841d 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -70,14 +70,14 @@ Ready to contribute? Here's how to set up `erepublik` for local development.
 
    Now you can make your changes locally.
 
-5. When you're done making changes, check that your changes pass flake8 and the
-   tests, including testing other Python versions with tox::
+5. When you're done making changes, check that your changes pass flake8, isort and the
+   tests::
 
     $ flake8 erepublik tests
-    $ python setup.py test or py.test
-    $ tox
+    $ isort erepublik
+    $ python setup.py test
 
-   To get flake8 and tox, just pip install them into your virtualenv.
+   To get flake8 and isort, just pip install them into your virtualenv.
 
 6. Commit your changes and push your branch to GitHub::
 
diff --git a/Makefile b/Makefile
index be369f5..6bd5634 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,6 @@ clean-pyc: ## remove Python file artifacts
 	rm -rf log/
 
 clean-test: ## remove test and coverage artifacts
-	rm -fr .tox/
 	rm -f .coverage
 	rm -fr htmlcov/
 	rm -fr .pytest_cache
@@ -58,9 +57,6 @@ lint: ## check style with flake8
 test: ## run tests quickly with the default Python
 	python setup.py test
 
-test-all: ## run tests on every Python version with tox
-	tox
-
 coverage: ## check code coverage quickly with the default Python
 	coverage run --source erepublik setup.py test
 	coverage report -m
@@ -80,6 +76,7 @@ servedocs: docs ## compile the docs watching for changes
 
 release: dist ## package and upload a release
 	twine upload dist/*
+	clean
 
 dist: clean ## builds source and wheel package
 	python setup.py sdist
diff --git a/erepublik/__init__.py b/erepublik/__init__.py
index 5bc73de..d9ba8ca 100644
--- a/erepublik/__init__.py
+++ b/erepublik/__init__.py
@@ -6,7 +6,7 @@ __author__ = """Eriks Karls"""
 __email__ = 'eriks@72.lv'
 __version__ = '0.23.3.2'
 
-from erepublik import classes, utils, constants
+from erepublik import classes, constants, utils
 from erepublik.citizen import Citizen
 
 __all__ = ["classes", "utils", "Citizen", 'constants']
diff --git a/erepublik/citizen.py b/erepublik/citizen.py
index 0206094..8c83f9e 100644
--- a/erepublik/citizen.py
+++ b/erepublik/citizen.py
@@ -11,7 +11,7 @@ from typing import Any, Dict, List, NoReturn, Optional, Set, Tuple, Union
 
 from requests import HTTPError, RequestException, Response
 
-from . import utils, classes, access_points, constants
+from . import access_points, classes, constants, utils
 from .classes import OfferItem
 
 
diff --git a/erepublik/classes.py b/erepublik/classes.py
index e953474..7073601 100644
--- a/erepublik/classes.py
+++ b/erepublik/classes.py
@@ -3,11 +3,11 @@ import hashlib
 import threading
 import weakref
 from decimal import Decimal
-from typing import Any, Dict, List, NamedTuple, Tuple, Union, NoReturn, Generator, Iterable
+from typing import Any, Dict, Generator, Iterable, List, NamedTuple, NoReturn, Tuple, Union
 
 from requests import Response, Session, post
 
-from . import utils, constants
+from . import constants, utils
 
 __all__ = ['Battle', 'BattleDivision', 'BattleSide', 'Company', 'Config', 'Details', 'Energy', 'ErepublikException',
            'ErepublikNetworkException', 'EnergyToFight',
diff --git a/erepublik/utils.py b/erepublik/utils.py
index 1f20212..9c4e862 100644
--- a/erepublik/utils.py
+++ b/erepublik/utils.py
@@ -10,7 +10,7 @@ import unicodedata
 import warnings
 from decimal import Decimal
 from pathlib import Path
-from typing import Any, List, Optional, Union, Dict
+from typing import Any, Dict, List, Optional, Union
 
 import requests
 
@@ -158,6 +158,7 @@ def write_file(filename: str, content: str) -> int:
 
 def write_request(response: requests.Response, is_error: bool = False):
     from erepublik import Citizen
+
     # Remove GET args from url name
     url = response.url
     last_index = url.index("?") if "?" in url else len(response.url)
diff --git a/examples/eat_work_train.py b/examples/eat_work_train.py
index a7d824f..63f1e11 100644
--- a/examples/eat_work_train.py
+++ b/examples/eat_work_train.py
@@ -1,6 +1,6 @@
 from datetime import timedelta
 
-from erepublik import Citizen, utils, constants
+from erepublik import Citizen, constants, utils
 
 CONFIG = {
     'email': 'player@email.com',
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 32b3d19..9a72af0 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -4,16 +4,15 @@ edx-sphinx-theme==1.5.0
 flake8==3.8.4
 ipython>=7.19.0
 isort==5.6.4
-pip==20.3.1
+pip==20.3.3
 PyInstaller==4.1
 pytz==2020.4
-pytest==6.1.2
+pytest==6.2.1
 responses==0.12.1
 setuptools==51.0.0
 Sphinx==3.3.1
-requests==2.25.0
+requests>=2.24.0,<2.26.0
 PySocks==1.7.1
-tox==3.20.1
 twine==3.2.0
-watchdog==1.0.0
-wheel==0.36.1
+wheel==0.36.2
+pur==5.3.0
diff --git a/setup.cfg b/setup.cfg
index d678d61..5f45fac 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,13 +18,13 @@ replace = __version__ = '{new_version}'
 universal = 1
 
 [flake8]
-exclude = docs,.tox,.git,log,debug,venv
+exclude = docs,.git,log,debug,venv
 max-line-length = 120
 ignore = D100,D101,D102,D103
 
 [pycodestyle]
 max-line-length = 120
-exclude = .tox,.git,log,debug,venv, build
+exclude = .git,log,debug,venv, build
 
 [mypy]
 python_version = 3.7
diff --git a/setup.py b/setup.py
index cc834bb..629df41 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ with open('HISTORY.rst') as history_file:
 
 requirements = [
     'pytz==2020.4',
-    'requests==2.25.0',
+    'requests>=2.24.0,<2.26.0',
     'PySocks==1.7.1'
 ]
 
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 820fb35..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,18 +0,0 @@
-[tox]
-envlist = py37, py38, flake8
-
-[travis]
-python =
-    3.7: py37
-    3.8: py38
-
-[testenv:flake8]
-basepython = python
-deps = flake8
-commands = flake8 erepublik_script
-
-[testenv]
-setenv =
-    PYTHONPATH = {toxinidir}
-
-commands = python setup.py test