diff --git a/pyproject.toml b/pyproject.toml
index cde79074..607fd4c8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,3 +50,9 @@ addopts = [
     "--strict-markers",
     "--doctest-modules"
 ]
+
+[tool.isort]
+profile = "black"
+line_length = 100
+force_single_line = true
+skip_gitignore = true
diff --git a/requirements.txt b/requirements.txt
index 98cf9723..f253417d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ packaging==21.0
 pyparsing==2.4.7
 semantic-version==2.8.5
 semver==2.13.0
+isort==5.10.1
diff --git a/setup.cfg b/setup.cfg
index 046ad1a1..1b726abd 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -74,6 +74,7 @@ testing =
     aboutcode-toolkit >= 6.0.0
     black
     commoncode
+    isort>=5.10.1
 
 docs =
     Sphinx >= 3.3.1
diff --git a/src/univers/debian.py b/src/univers/debian.py
index ae90c596..e7ab6ba4 100644
--- a/src/univers/debian.py
+++ b/src/univers/debian.py
@@ -15,8 +15,8 @@
 from itertools import zip_longest
 
 from attr import asdict
-from attr import attrs
 from attr import attrib
+from attr import attrs
 
 logger = logging.getLogger(__name__)
 
diff --git a/src/univers/version_constraint.py b/src/univers/version_constraint.py
index b8f4c9b0..1cc87552 100644
--- a/src/univers/version_constraint.py
+++ b/src/univers/version_constraint.py
@@ -8,6 +8,7 @@
 from functools import total_ordering
 
 import attr
+
 from univers.utils import remove_spaces
 from univers.versions import Version
 
diff --git a/src/univers/versions.py b/src/univers/versions.py
index 6a06b40d..7f996657 100644
--- a/src/univers/versions.py
+++ b/src/univers/versions.py
@@ -4,8 +4,8 @@
 #
 # Visit https://aboutcode.org and https://github.com/nexB/univers for support and download.
 
-from functools import total_ordering
 import functools
+from functools import total_ordering
 
 import attr
 import semantic_version
@@ -14,9 +14,9 @@
 from univers import arch
 from univers import debian
 from univers import gem
-from univers import nuget
 from univers import gentoo
 from univers import maven
+from univers import nuget
 from univers import rpm
 from univers.utils import remove_spaces
 
diff --git a/tests/nuget/test_nuget_floating_range.py b/tests/nuget/test_nuget_floating_range.py
index 958d4c97..53e7c675 100644
--- a/tests/nuget/test_nuget_floating_range.py
+++ b/tests/nuget/test_nuget_floating_range.py
@@ -8,7 +8,6 @@
 from univers.version_range import NugetVersionRange as VersionRange
 from univers.versions import NugetVersion as NuGetVersion
 
-
 """
 NuGet Float ranges are not yet supported in Univers.
 
diff --git a/tests/nuget/test_nuget_semver_201_spec.py b/tests/nuget/test_nuget_semver_201_spec.py
index 72329321..d091f714 100644
--- a/tests/nuget/test_nuget_semver_201_spec.py
+++ b/tests/nuget/test_nuget_semver_201_spec.py
@@ -5,8 +5,8 @@
 
 import pytest
 
-from univers.utils import cmp
 from univers import nuget
+from univers.utils import cmp
 
 
 # A normal version number MUST take the form X.Y.Z
diff --git a/tests/test_alpine.py b/tests/test_alpine.py
index fc8e3714..681ed0ed 100644
--- a/tests/test_alpine.py
+++ b/tests/test_alpine.py
@@ -8,6 +8,7 @@
 from typing import NamedTuple
 
 import pytest
+
 from univers.versions import AlpineLinuxVersion
 from univers.versions import InvalidVersion
 
diff --git a/tests/test_codestyle.py b/tests/test_codestyle.py
index 3bf3ed12..d63b20ee 100644
--- a/tests/test_codestyle.py
+++ b/tests/test_codestyle.py
@@ -22,3 +22,16 @@ def test_codestyle(self):
                 "  python -m black -l 100 setup.py src tests",
                 e.output,
             ) from e
+
+        args = "isort --check-only src tests setup.py"
+        try:
+            subprocess.check_output(args.split())
+        except Exception as e:
+            print("===========================================================")
+            print(e.output)
+            print("===========================================================")
+            raise Exception(
+                "Unsorted imports, please sort your imports using isort. "
+                "Alternatively, run ``isort src tests setup.py``",
+                e.output,
+            ) from e
diff --git a/tests/test_debian_version.py b/tests/test_debian_version.py
index da7f8c16..c9507f5b 100644
--- a/tests/test_debian_version.py
+++ b/tests/test_debian_version.py
@@ -16,9 +16,9 @@
 import pytest
 
 import univers.debian as version
+from univers.debian import Version
 from univers.debian import compare_strings
 from univers.debian import compare_versions
-from univers.debian import Version
 
 """
 Parse, compare and sort Debian package versions.
diff --git a/tests/test_gentoo.py b/tests/test_gentoo.py
index f87b2898..eeabacbc 100644
--- a/tests/test_gentoo.py
+++ b/tests/test_gentoo.py
@@ -7,6 +7,7 @@
 
 
 from unittest import TestCase
+
 from univers.gentoo import vercmp
 
 
diff --git a/tests/test_maven_version.py b/tests/test_maven_version.py
index 4b4d71a4..97d25585 100644
--- a/tests/test_maven_version.py
+++ b/tests/test_maven_version.py
@@ -8,11 +8,11 @@
 
 import unittest
 
+from univers.maven import Restriction
+from univers.maven import RestrictionParseError
 from univers.maven import Version
 from univers.maven import VersionRange
-from univers.maven import RestrictionParseError
 from univers.maven import VersionRangeParseError
-from univers.maven import Restriction
 
 
 class TestRestriction(unittest.TestCase):
diff --git a/tests/test_maven_version_range.py b/tests/test_maven_version_range.py
index 877582a2..2f487a04 100644
--- a/tests/test_maven_version_range.py
+++ b/tests/test_maven_version_range.py
@@ -4,8 +4,8 @@
 #
 # Visit https://aboutcode.org and https://github.com/nexB/univers for support and download.
 
-from univers.version_range import MavenVersionRange
 from univers.version_constraint import VersionConstraint
+from univers.version_range import MavenVersionRange
 from univers.versions import MavenVersion
 
 
diff --git a/tests/test_nuget.py b/tests/test_nuget.py
index f4b9d2a9..a34cc887 100644
--- a/tests/test_nuget.py
+++ b/tests/test_nuget.py
@@ -18,6 +18,7 @@
 # https://github.com/NuGet/NuGet.Client/blob/dev/test/NuGet.Core.Tests/NuGet.Versioning.Test/VersionComparerTests.cs
 
 import unittest
+
 from univers.versions import NugetVersion
 
 
diff --git a/tests/test_openssl_vercmp.py b/tests/test_openssl_vercmp.py
index 65191350..7f5a622c 100644
--- a/tests/test_openssl_vercmp.py
+++ b/tests/test_openssl_vercmp.py
@@ -7,6 +7,7 @@
 import operator
 
 import pytest
+
 from univers.versions import LegacyOpensslVersion
 from univers.versions import OpensslVersion
 from univers.versions import SemverVersion
diff --git a/tests/test_openssl_versort.py b/tests/test_openssl_versort.py
index 6706fed4..08627e60 100644
--- a/tests/test_openssl_versort.py
+++ b/tests/test_openssl_versort.py
@@ -7,6 +7,7 @@
 from pathlib import Path
 
 from commoncode import testcase
+
 from tests import util_tests
 from univers.versions import OpensslVersion
 
diff --git a/tests/test_pypi_version.py b/tests/test_pypi_version.py
index f2331d82..b33173d7 100644
--- a/tests/test_pypi_version.py
+++ b/tests/test_pypi_version.py
@@ -4,9 +4,10 @@
 #
 # Visit https://aboutcode.org and https://github.com/nexB/univers for support and download.
 
-from packaging import version as packaging_version
 from unittest import TestCase
 
+from packaging import version as packaging_version
+
 from univers import versions
 
 # version comparison is already tested at:
diff --git a/tests/test_skeleton_codestyle.py b/tests/test_skeleton_codestyle.py
index 32b8a27e..3304806a 100644
--- a/tests/test_skeleton_codestyle.py
+++ b/tests/test_skeleton_codestyle.py
@@ -7,9 +7,9 @@
 # See https://aboutcode.org for more information about nexB OSS projects.
 #
 
+import configparser
 import subprocess
 import unittest
-import configparser
 
 
 class BaseTests(unittest.TestCase):
diff --git a/tests/test_vers.py b/tests/test_vers.py
index 57eb8a68..e4258499 100644
--- a/tests/test_vers.py
+++ b/tests/test_vers.py
@@ -9,9 +9,9 @@
 import os
 import re
 import unittest
+from unittest.case import expectedFailure
 
 from univers.version_range import VersionRange
-from unittest.case import expectedFailure
 
 
 def create_test_function(
diff --git a/tests/test_version_range.py b/tests/test_version_range.py
index a709d012..70332838 100644
--- a/tests/test_version_range.py
+++ b/tests/test_version_range.py
@@ -6,24 +6,25 @@
 
 import json
 from unittest import TestCase
+
 import pytest
 
 from univers.version_constraint import VersionConstraint
+from univers.version_range import RANGE_CLASS_BY_SCHEMES
 from univers.version_range import GemVersionRange
+from univers.version_range import InvalidVersionRange
 from univers.version_range import MattermostVersionRange
-from univers.version_range import from_gitlab_native
+from univers.version_range import NpmVersionRange
 from univers.version_range import NugetVersionRange
-from univers.version_range import InvalidVersionRange
+from univers.version_range import OpensslVersionRange
 from univers.version_range import PypiVersionRange
 from univers.version_range import VersionRange
-from univers.version_range import RANGE_CLASS_BY_SCHEMES
-from univers.version_range import NpmVersionRange
-from univers.version_range import OpensslVersionRange
-from univers.versions import PypiVersion
+from univers.version_range import from_gitlab_native
 from univers.versions import NugetVersion
+from univers.versions import OpensslVersion
+from univers.versions import PypiVersion
 from univers.versions import RubygemsVersion
 from univers.versions import SemverVersion
-from univers.versions import OpensslVersion
 
 
 class TestVersionRange(TestCase):