diff --git a/MANIFEST.in b/MANIFEST.in
index 7a34c052..51ffe004 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,4 +1,12 @@
-include README.md
-include LICENSE
-recursive-include pyinstrument *.js *.css
-include pyinstrument/py.typed
+prune **
+
+graft pyinstrument
+graft test
+graft bin
+graft html_renderer
+prune html_renderer/node_modules
+prune html_renderer/dist
+
+include LICENSE README.md pyproject.toml setup.py setup.cfg noxfile.py requirements-dev.txt
+
+global-exclude __pycache__ *.py[cod] .* dist
diff --git a/setup.py b/setup.py
index 1cca7187..0fc734cd 100644
--- a/setup.py
+++ b/setup.py
@@ -1,14 +1,14 @@
 import os
 from pathlib import Path
 
-from setuptools import Extension, find_packages, setup
+from setuptools import Extension, find_namespace_packages, setup
 
 PROJECT_ROOT = Path(__file__).parent
 long_description = (PROJECT_ROOT / "README.md").read_text(encoding="utf8")
 
 setup(
     name="pyinstrument",
-    packages=find_packages(include=["pyinstrument", "pyinstrument.*"]),
+    packages=find_namespace_packages(include=["pyinstrument*"]),
     version="4.4.0",
     ext_modules=[
         Extension(