diff --git a/requirements.txt b/requirements.txt
index 1f953e2f..f763956b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,13 +5,14 @@ charset-normalizer==2.1.0
 click==8.1.3
 colorama==0.4.5
 commoncode==30.2.0
-dparse2==0.6.1
+dparse2==0.7.0
 idna==3.3
 importlib-metadata==4.12.0
 intbitset==3.0.1
 packageurl-python==0.10.0
 packaging==21.3
-pip-requirements-parser==31.2.0
+packvers==21.5
+pip-requirements-parser==32.0.1
 pkginfo2==30.0.0
 pyparsing==3.0.9
 PyYAML==6.0
diff --git a/setup.cfg b/setup.cfg
index 73d7b7e6..04e3412b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -58,18 +58,19 @@ install_requires =
     click > 7.0
     colorama >= 0.3.9
     commoncode >= 30.0.0
-    dparse2 >= 0.6.1
+    dparse2 >= 0.7.0
     importlib_metadata >= 4.12.0
     packageurl_python >= 0.9.0
     pkginfo2 >= 30.0.0
-    pip-requirements-parser >= 31.2.0
+    pip-requirements-parser >= 32.0.1
     requests >= 2.18.0
     resolvelib >= 0.8.1
     saneyaml >= 0.5.2
     tinynetrc >= 1.3.1
     toml >= 0.10.0
     mock >= 3.0.5
-
+    packaging >= 21.0.0
+    packvers >= 21.5
 [options.packages.find]
 where = src
 
diff --git a/src/_packagedcode/pypi.py b/src/_packagedcode/pypi.py
index a76b6f8d..b6dc3e91 100644
--- a/src/_packagedcode/pypi.py
+++ b/src/_packagedcode/pypi.py
@@ -20,18 +20,16 @@
 from typing import NamedTuple
 import tempfile
 import zipfile
-
 import dparse2
-import packaging
+import packvers as packaging
 import pip_requirements_parser
-import pkginfo2
 from commoncode import fileutils
-from packaging.specifiers import SpecifierSet
+from packvers.specifiers import SpecifierSet
 from packageurl import PackageURL
-from packaging import markers
-from packaging.requirements import Requirement
-from packaging.utils import canonicalize_name
-
+from packvers import markers
+from packvers.requirements import Requirement
+from packvers.utils import canonicalize_name
+import pkginfo2
 from _packagedcode import models
 from _packagedcode.utils import build_description
 from _packagedcode.utils import combine_expressions
diff --git a/src/python_inspector/api.py b/src/python_inspector/api.py
index 42711568..f4278b6f 100644
--- a/src/python_inspector/api.py
+++ b/src/python_inspector/api.py
@@ -16,7 +16,7 @@
 from typing import Sequence
 
 from packageurl import PackageURL
-from packaging.requirements import Requirement
+from packvers.requirements import Requirement
 from resolvelib import BaseReporter
 from resolvelib import Resolver
 from tinynetrc import Netrc
diff --git a/src/python_inspector/dependencies.py b/src/python_inspector/dependencies.py
index 7ba7fcb6..a7aec863 100644
--- a/src/python_inspector/dependencies.py
+++ b/src/python_inspector/dependencies.py
@@ -10,7 +10,7 @@
 #
 
 from packageurl import PackageURL
-from packaging.requirements import Requirement
+from packvers.requirements import Requirement
 from pip_requirements_parser import InstallRequirement
 
 from _packagedcode import models
diff --git a/src/python_inspector/resolution.py b/src/python_inspector/resolution.py
index 8c0016c6..c86f7a8a 100644
--- a/src/python_inspector/resolution.py
+++ b/src/python_inspector/resolution.py
@@ -18,12 +18,12 @@
 from typing import Union
 from zipfile import ZipFile
 
-import packaging.utils
+import packvers.utils
 from packageurl import PackageURL
-from packaging.requirements import Requirement
-from packaging.version import LegacyVersion
-from packaging.version import Version
-from packaging.version import parse as parse_version
+from packvers.requirements import Requirement
+from packvers.version import LegacyVersion
+from packvers.version import Version
+from packvers.version import parse as parse_version
 from resolvelib import AbstractProvider
 from resolvelib.structs import DirectedGraph
 
@@ -325,7 +325,7 @@ def __init__(
 
     def identify(self, requirement_or_candidate: Union[Candidate, Requirement]) -> str:
         """Given a requirement, return an identifier for it. Overridden."""
-        name = packaging.utils.canonicalize_name(requirement_or_candidate.name)
+        name = packvers.utils.canonicalize_name(requirement_or_candidate.name)
         if requirement_or_candidate.extras:
             extras_str = ",".join(sorted(requirement_or_candidate.extras))
             return "{}[{}]".format(name, extras_str)
@@ -576,7 +576,7 @@ def _iter_dependencies(self, candidate: Candidate) -> Generator[Requirement, Non
         """
         Yield dependencies for the given candidate.
         """
-        name = packaging.utils.canonicalize_name(candidate.name)
+        name = packvers.utils.canonicalize_name(candidate.name)
         # TODO: handle extras https://github.com/nexB/python-inspector/issues/10
         if candidate.extras:
             r = f"{name}=={candidate.version}"
diff --git a/src/python_inspector/setup_py_live_eval.py b/src/python_inspector/setup_py_live_eval.py
index 129cc185..e9515e55 100755
--- a/src/python_inspector/setup_py_live_eval.py
+++ b/src/python_inspector/setup_py_live_eval.py
@@ -21,7 +21,7 @@
 import mock
 import setuptools
 from commoncode.command import pushd
-from packaging.requirements import Requirement
+from packvers.requirements import Requirement
 
 
 def minver_error(pkg_name):
diff --git a/src/python_inspector/utils_pip_compatibility_tags.py b/src/python_inspector/utils_pip_compatibility_tags.py
index 122ae59a..afe3fb3b 100644
--- a/src/python_inspector/utils_pip_compatibility_tags.py
+++ b/src/python_inspector/utils_pip_compatibility_tags.py
@@ -27,12 +27,12 @@
 
 import re
 
-from packaging.tags import compatible_tags
-from packaging.tags import cpython_tags
-from packaging.tags import generic_tags
-from packaging.tags import interpreter_name
-from packaging.tags import interpreter_version
-from packaging.tags import mac_platforms
+from packvers.tags import compatible_tags
+from packvers.tags import cpython_tags
+from packvers.tags import generic_tags
+from packvers.tags import interpreter_name
+from packvers.tags import interpreter_version
+from packvers.tags import mac_platforms
 
 _osx_arch_pat = re.compile(r"(.+)_(\d+)_(\d+)_(.+)")
 
diff --git a/src/python_inspector/utils_pypi.py b/src/python_inspector/utils_pypi.py
index 7b30525d..f7e21d1a 100644
--- a/src/python_inspector/utils_pypi.py
+++ b/src/python_inspector/utils_pypi.py
@@ -26,9 +26,9 @@
 from bs4 import BeautifulSoup
 from commoncode import fileutils
 from commoncode.hash import multi_checksums
-from packaging import tags as packaging_tags
-from packaging import version as packaging_version
-from packaging.specifiers import SpecifierSet
+from packvers import tags as packaging_tags
+from packvers import version as packaging_version
+from packvers.specifiers import SpecifierSet
 
 from python_inspector import DEFAULT_PYTHON_VERSION
 from python_inspector import utils_pip_compatibility_tags
diff --git a/tests/test_resolution.py b/tests/test_resolution.py
index d470b084..3e430906 100644
--- a/tests/test_resolution.py
+++ b/tests/test_resolution.py
@@ -11,10 +11,10 @@
 import os
 from unittest.mock import patch
 
-import packaging
+import packvers
 import pytest
 from commoncode.testcase import FileDrivenTesting
-from packaging.requirements import Requirement
+from packvers.requirements import Requirement
 
 from _packagedcode import models
 from python_inspector.api import get_resolved_dependencies
@@ -156,7 +156,7 @@ def test_without_supported_wheels():
 
 
 def test_is_valid_version():
-    parsed_version = packaging.version.parse("2.1.2")
+    parsed_version = packvers.version.parse("2.1.2")
     requirements = {"flask": [Requirement("flask>2.0.0")]}
     bad_versions = []
     identifier = "flask"
@@ -164,7 +164,7 @@ def test_is_valid_version():
 
 
 def test_is_valid_version_with_no_specifier():
-    parsed_version = packaging.version.parse("2.1.2")
+    parsed_version = packvers.version.parse("2.1.2")
     requirements = {"flask": [Requirement("flask")]}
     bad_versions = []
     identifier = "flask"
@@ -172,7 +172,7 @@ def test_is_valid_version_with_no_specifier():
 
 
 def test_is_valid_version_with_no_specifier_and_pre_release():
-    parsed_version = packaging.version.parse("1.0.0b4")
+    parsed_version = packvers.version.parse("1.0.0b4")
     requirements = {"flask": [Requirement("flask")]}
     bad_versions = []
     identifier = "flask"