diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 90194e9a..00000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1,12 +0,0 @@
-include doc/*.sh
-include doc/*.rst
-include doc/*.tikz
-include doc/images/*.png
-include doc/Makefile
-
-include LICENSE
-include README.rst
-
-prune .github
-exclude .gitlab-ci.yml
-exclude .gitignore
diff --git a/boxtree/version.py b/boxtree/version.py
index 6920f0f9..3a97f1b4 100644
--- a/boxtree/version.py
+++ b/boxtree/version.py
@@ -4,7 +4,7 @@
 def _parse_version(version: str) -> tuple[tuple[int, ...], str]:
     import re
 
-    m = re.match("^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
+    m = re.match(r"^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
     assert m is not None
 
     return tuple(int(nr) for nr in m.group(1).split(".")), m.group(2)
diff --git a/pyproject.toml b/pyproject.toml
index 33bf5119..a9c478d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,8 +1,6 @@
 [build-system]
-build-backend = "setuptools.build_meta"
-requires = [
-    "setuptools>=63",
-]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
 
 [project]
 name = "boxtree"
@@ -63,11 +61,6 @@ test = [
 Documentation = "https://documen.tician.de/boxtree"
 Repository = "https://github.com/inducer/boxtree"
 
-[tool.setuptools.packages.find]
-include = [
-    "boxtree*",
-]
-
 [tool.ruff]
 preview = true