diff --git a/lazy_loader/__init__.py b/lazy_loader/__init__.py
index 6bec8f8..ae593c8 100644
--- a/lazy_loader/__init__.py
+++ b/lazy_loader/__init__.py
@@ -13,6 +13,7 @@
 import types
 import warnings
 
+__version__ = "0.4rc0.dev0"
 __all__ = ["attach", "load", "attach_stub"]
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 6c13203..633e8b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,11 +4,11 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "lazy_loader"
-version = "0.4rc0.dev0"
 requires-python = ">=3.7"
 authors = [{name = "Scientific Python Developers"}]
 readme = "README.md"
 license = {file = "LICENSE.md"}
+dynamic = ['version']
 classifiers = [
   "Development Status :: 4 - Beta",
   "License :: OSI Approved :: BSD License",
@@ -35,6 +35,9 @@ dev = ["changelist == 0.4"]
 Home = "https://scientific-python.org/specs/spec-0001/"
 Source = "https://github.com/scientific-python/lazy_loader"
 
+[tool.setuptools.dynamic.version]
+attr = 'lazy_loader.__version__'
+
 [tool.ruff]
 line-length = 88
 target-version = "py37"