diff --git a/pyproject.toml b/pyproject.toml
index 1f57540..95810be 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-	"setuptools >= 43.0.0",
+	"setuptools >= 46.4.0",
 	"wheel >= 0.32.0",
 ]
 build-backend = "setuptools.build_meta"
diff --git a/setup.cfg b/setup.cfg
index 418f243..040af66 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,12 +1,6 @@
 [metadata]
 name = rsrcfork
-# The version is defined in setup.py,
-# which extracts the value of the __version__ attribute from rsrcfork/__init__.py,
-# so that the version number/string is only explicitly written in a single place.
-# We cannot use "version = attr: rsrcfork.__version__" here,
-# because the attr directive needs to import the module to read its attributes,
-# which won't work if any of the module's import-time dependencies are not installed yet
-# (as is usually the case when setup.cfg is first evaluated before installation).
+version = attr: rsrcfork.__version__
 url = https://github.com/dgelessus/python-rsrcfork
 author = dgelessus
 classifiers =
diff --git a/setup.py b/setup.py
index a6ecd8b..5bce6c2 100644
--- a/setup.py
+++ b/setup.py
@@ -1,39 +1,5 @@
 #!/usr/bin/env python3
 
-import ast
 import setuptools
 
-
-def attr(file, name):
-	"""Read the constant value of a global variable from a Python file without importing/executing it.
-	
-	The variable in question must be assigned a constant literal
-	(as understood by :func:`ast.literal_eval`)
-	in a simple assignment.
-	The variable *should* only be assigned once
-	(later assignments are silently ignored).
-	
-	Based on https://github.com/pypa/setuptools/issues/1960#issue-547330414.
-	"""
-	
-	with open(file, "rb") as f:
-		module = ast.parse(f.read())
-	
-	for node in ast.iter_child_nodes(module):
-		if (
-			isinstance(node, ast.Assign)
-			and len(node.targets) == 1
-			and isinstance(node.targets[0], ast.Name)
-			and node.targets[0].id == name
-		):
-			return ast.literal_eval(node.value)
-	else:
-		raise ValueError(f"No simple assignment of variable {name!r} found in {file!r}")
-
-
-setuptools.setup(
-	# Read the version number from the module source code without importing or executing it.
-	# This is necessary because at the time that setup.py is executed,
-	# the dependencies necessary to import rsrcfork may not be installed yet.
-	version=attr("rsrcfork/__init__.py", "__version__"),
-)
+setuptools.setup()