diff --git a/CHANGES.rst b/CHANGES.rst
index d6e7d86..a2f5eee 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,10 +2,10 @@
 Change log for zope.pytestlayer
 =================================
 
-8.4 (unreleased)
+9.0 (unreleased)
 ================
 
-- Nothing changed yet.
+- Replace ``pkg_resources`` namespace with PEP 420 native namespace.
 
 
 8.3 (2025-05-15)
diff --git a/setup.py b/setup.py
index 7d0d4ba..6707165 100644
--- a/setup.py
+++ b/setup.py
@@ -1,12 +1,11 @@
 """Integration of zope.testrunner-style test layers into pytest framework"""
 
-from setuptools import find_packages
 from setuptools import setup
 
 
 setup(
     name='zope.pytestlayer',
-    version='8.4.dev0',
+    version='9.0.dev0',
 
     python_requires='>=3.9',
     install_requires=[
@@ -68,9 +67,6 @@
         'HACKING.rst',
         'CHANGES.rst',
     )),
-    namespace_packages=['zope'],
-    packages=find_packages('src'),
-    package_dir={'': 'src'},
     include_package_data=True,
     zip_safe=False,
 )
diff --git a/src/zope/__init__.py b/src/zope/__init__.py
deleted file mode 100644
index de40ea7..0000000
--- a/src/zope/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)
diff --git a/src/zope/pytestlayer/tests/test_layer.py b/src/zope/pytestlayer/tests/test_layer.py
index 6cb84e6..105392d 100644
--- a/src/zope/pytestlayer/tests/test_layer.py
+++ b/src/zope/pytestlayer/tests/test_layer.py
@@ -9,5 +9,5 @@ class LayerClass:
 
 
 def test_get_layer_name_accounts_layers_importable_by_an_arbitrary_name():
-    assert 'zope.pytestlayer.tests.test_layer.layer' == \
+    assert 'pytestlayer.tests.test_layer.layer' == \
         fixture.get_layer_name(layer)