diff --git a/docs/development.rst b/docs/development.rst
index 003ffad96c2e059689403a4f34be6ef5ee4bc9f8..796247231e907b4debc8de8a628a3c84227ba96a 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -70,13 +70,8 @@ functional tests (within ``functional_tests/`` directory).
 Tests can be run in a number of different ways, depending on what you
 want to test and how.
 
-To run the unit tests via setup script, run the following command from
-repository root::
-
-  python setup.py test
-
-To run the unit tests directly, run the following command from
-repository root::
+To run the unit tests, run the following command from repository
+root::
 
   pytest
 
@@ -125,16 +120,16 @@ Tests can also be run using `tox <https://tox.readthedocs.io/>`_:
 ::
 
   # Run full suite of tests on all supported Python versions.
-  tox
+  tox run
 
   # List available tox environments.
-  tox -l
+  tox list
 
   # Run tests against specific Python version.
-  tox -e py38
+  tox run -e py38
 
   # Run documentation and linting tests only.
-  tox -e doc,lint
+  tox run -e doc,lint
 
 
 Running tests on all supproted Python versions
@@ -180,7 +175,7 @@ perform the following steps:
 
 ::
 
-     tox --workdir /tmp/
+     tox run --workdir /tmp/
 
 
 Building documentation
diff --git a/setup.cfg b/setup.cfg
deleted file mode 100644
index 9af7e6f11bb01f7306f796faf7bfbe3e2955cd94..0000000000000000000000000000000000000000
--- a/setup.cfg
+++ /dev/null
@@ -1,2 +0,0 @@
-[aliases]
-test=pytest
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 7d5b340bb555af25f01c6a29df2c2eebdd961342..b2b5a277ad7c90669124f1ec45d1e88a9f685e98 100755
--- a/setup.py
+++ b/setup.py
@@ -36,25 +36,21 @@ doc_requirements = [
 ]
 
 test_lint_requirements = [
-    'flake8>=3.8,<3.9',
+    'flake8>=7.0,<7.1',
 ]
 
 test_requirements = [
-    'freezegun>=1.0,<1.1',
-    'pytest>=6.1,<6.2',
-    'pytest-cov>=2.10,<2.11',
-    'tox>=3.20,<3.21',
-    'pexpect>=4.8,<4.9',
+    'freezegun>=1.3,<1.4',
+    'pytest>=8.0,<8.1',
+    'pytest-cov>=4.1,<4.2',
+    'tox>=4.13,<4.14',
+    'pexpect>=4.9,<4.10',
 ]
 
 release_requirements = [
     'twine',
 ]
 
-setup_requirements = [
-    'pytest-runner>=5.2,<5.3',
-]
-
 development_requirements = doc_requirements + test_requirements + test_lint_requirements + release_requirements
 
 extras_requirements = {
@@ -80,7 +76,6 @@ setup(
     author_email='branko@majic.rs',
     python_requires=python_requirements,
     install_requires=install_requirements,
-    setup_requires=setup_requirements,
     tests_require=test_requirements,
     extras_require=extras_requirements,
     entry_points={
diff --git a/tox.ini b/tox.ini
index 36705607c0a9f4f2688ea265a2fd01f2b4f504f2..e92d203da7b26bca7e9416b33be25266b3b2b3e6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 envlist = {py38,py39},lint,doc
 
 [testenv]
-whitelist_externals =
+allowlist_externals =
   make
 
 basepython =
@@ -14,6 +14,11 @@ basepython =
 deps =
   .[test]
 
+setenv =
+  # Force column width for functional tests since they depend on
+  # predictable output format.
+  COLUMNS=80
+
 commands =
   # Must specify cov-report explicitly, otherwise coverage starts
   # going through the tests as well.