diff --git a/CHANGES.rst b/CHANGES.rst
index 20d4d26..7068a4e 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@ Changes
 6.1 (unreleased)
 ================
 
-- Nothing changed yet.
+- Replace pkg_resources with PEP 420 namespace package
 
 
 6.0 (2025-03-10)
diff --git a/setup.py b/setup.py
index d0e8419..9b5d9a4 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,3 @@
-from setuptools import find_packages
 from setuptools import setup
 import os.path
 
@@ -38,17 +37,13 @@
         open('CHANGES.rst').read()),
     license="MIT",
     url='https://github.com/gocept/gocept.cache',
-    packages=find_packages('src'),
-    package_dir={'': 'src'},
 
     include_package_data=True,
     zip_safe=False,
 
-    namespace_packages=['gocept'],
     python_requires='>=3.8',
     install_requires=[
         'decorator',
-        'setuptools',
         'transaction',
         'zope.testing',
     ],
diff --git a/src/gocept/__init__.py b/src/gocept/__init__.py
deleted file mode 100644
index 656dc0f..0000000
--- a/src/gocept/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)  # pragma: no cover