diff --git a/.github/workflows/test-matrix.yml b/.github/workflows/test-matrix.yml
index f96e807..8596af2 100644
--- a/.github/workflows/test-matrix.yml
+++ b/.github/workflows/test-matrix.yml
@@ -21,10 +21,6 @@ jobs:
         # [Python version, visual name, tox env]
         - ["3.13", "6.2 on py3.13", "py313-plone62"]
         - ["3.10", "6.2 on py3.10", "py310-plone62"]
-        - ["3.13", "6.1 on py3.13", "py313-plone61"]
-        - ["3.10", "6.1 on py3.10", "py310-plone61"]
-        - ["3.9", "6.0 on py3.9", "py39-plone60"]
-        - ["3.13", "6.0 on py3.13", "py313-plone60"]
 
     runs-on: ${{ matrix.os[1] }}
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
@@ -38,6 +34,14 @@ jobs:
       with:
         python-version: ${{ matrix.config[0] }}
         allow-prereleases: true
+
+##
+# Add extra configuration options in .meta.toml:
+#  [github]
+#  extra_lines_after_os_dependencies = """
+#  _your own configuration lines_
+#  """
+##
     - name: Pip cache
       uses: actions/cache@v4
       with:
@@ -57,3 +61,12 @@ jobs:
         if [ `tox list --no-desc -f init|wc -l` = 1 ]; then tox -e init;else true; fi
     - name: Test
       run: tox -e ${{ matrix.config[2] }}
+
+
+##
+# Add extra configuration options in .meta.toml:
+#  [github]
+#  extra_lines = """
+#  _your own configuration lines_
+#  """
+##
diff --git a/.meta.toml b/.meta.toml
index ff64ecb..2bf6a09 100644
--- a/.meta.toml
+++ b/.meta.toml
@@ -3,9 +3,11 @@
 # See the inline comments on how to expand/tweak this configuration file
 [meta]
 template = "default"
-commit-id = "2.0.1.dev0"
+commit-id = "2.2.1"
 
 [tox]
+test_matrix = {"6.2" = ["*"]}
 test_extras = """
     tests
 """
+
diff --git a/news/3928.breaking b/news/3928.breaking
new file mode 100644
index 0000000..4fb7ad4
--- /dev/null
+++ b/news/3928.breaking
@@ -0,0 +1,2 @@
+Replace ``pkg_resources`` namespace with PEP 420 native namespace.
+Support only Plone 6.2 and Python 3.10+.
diff --git a/setup.py b/setup.py
index 831c0d6..0e58ad0 100644
--- a/setup.py
+++ b/setup.py
@@ -1,9 +1,8 @@
 from pathlib import Path
-from setuptools import find_packages
 from setuptools import setup
 
 
-version = "2.0.6.dev0"
+version = "3.0.0.dev0"
 
 long_description = (
     f"{Path('README.rst').read_text()}\n{Path('CHANGES.rst').read_text()}"
@@ -34,15 +33,12 @@
         "Development Status :: 5 - Production/Stable",
         "Environment :: Web Environment",
         "Framework :: Plone",
-        "Framework :: Plone :: 6.0",
-        "Framework :: Plone :: 6.1",
+        "Framework :: Plone :: 6.2",
         "Framework :: Plone :: Core",
         "Framework :: Zope :: 5",
         "License :: OSI Approved :: GNU General Public License v2 (GPLv2)",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
@@ -53,12 +49,9 @@
     author_email="mailto:dexterity-development@googlegroups.com",
     url="http://plone.org/products/dexterity",
     license="GPL version 2",
-    packages=find_packages("src"),
-    package_dir={"": "src"},
-    namespace_packages=["plone", "plone.app"],
     include_package_data=True,
     zip_safe=False,
-    python_requires=">=3.8",
+    python_requires=">=3.10",
     install_requires=[
         "plone.app.dexterity[relations]",
         "plone.autoform",
@@ -70,7 +63,6 @@
         "plone.supermodel",
         "Products.CMFEditions>2.2.9",
         "Products.GenericSetup",
-        "setuptools",
         "z3c.form",
         "z3c.relationfield",
         "Zope",
diff --git a/src/plone/__init__.py b/src/plone/__init__.py
deleted file mode 100644
index 5284146..0000000
--- a/src/plone/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__("pkg_resources").declare_namespace(__name__)
diff --git a/src/plone/app/__init__.py b/src/plone/app/__init__.py
deleted file mode 100644
index 5284146..0000000
--- a/src/plone/app/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__("pkg_resources").declare_namespace(__name__)
diff --git a/tox.ini b/tox.ini
index aaf0b23..ba618ca 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,25 +11,17 @@ envlist =
     py312-plone62
     py311-plone62
     py310-plone62
-    py313-plone61
-    py312-plone61
-    py311-plone61
-    py310-plone61
-    py313-plone60
-    py312-plone60
-    py311-plone60
-    py310-plone60
-    py39-plone60
     dependencies
 
 
 ##
 # Add extra configuration options in .meta.toml:
 # - to specify a custom testing combination of Plone and python versions, use `test_matrix`
+#   Use ["*"] to use all supported Python versions for this Plone version.
 # - to specify extra custom environments, use `envlist_lines`
 # - to specify extra `tox` top-level options, use `config_lines`
 #  [tox]
-#  test_matrix = {"6.2" = ["3.13", "3.12"], "6.1" = ["3.10", "3.9"]}
+#  test_matrix = {"6.2" = ["3.13", "3.12"], "6.1" = ["*"]}
 #  envlist_lines = """
 #      my_other_environment
 #  """
@@ -121,8 +113,6 @@ set_env =
 deps =
     {[test_runner]deps}
     plone62: -c https://dist.plone.org/release/6.2-dev/constraints.txt
-    plone61: -c https://dist.plone.org/release/6.1-dev/constraints.txt
-    plone60: -c https://dist.plone.org/release/6.0-dev/constraints.txt
 
 ##
 # Specify additional deps in .meta.toml:
@@ -203,7 +193,6 @@ deps =
     build
     towncrier
     -c https://dist.plone.org/release/6.2-dev/constraints.txt
-
 commands =
     # fake version to not have to install the package
     # we build the change log as news entries might break
@@ -234,7 +223,6 @@ deps =
     pipdeptree
     pipforester
     -c https://dist.plone.org/release/6.2-dev/constraints.txt
-
 commands =
     # Generate the full dependency tree
     sh -c 'pipdeptree -j > forest.json'