diff --git a/masque/__init__.py b/masque/__init__.py
index 0f478d6..8c9529b 100644
--- a/masque/__init__.py
+++ b/masque/__init__.py
@@ -106,5 +106,5 @@ from .utils import (
 
 __author__ = 'Jan Petykiewicz'
 
-__version__ = '4.0a1'
+__version__ = '4.0a2'
 version = __version__       # legacy
diff --git a/pyproject.toml b/pyproject.toml
index 7faebfc..6ace09f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -63,6 +63,20 @@ dev = [
 requires = ["hatchling"]
 build-backend = "hatchling.build"
 
+[tool.hatch.build.targets.sdist]
+only-include = [
+    "masque",
+    "examples",
+    "stubs",
+    "pyproject.toml",
+    "README.md",
+    "LICENSE.md",
+    "MIGRATION.md",
+    ]
+
+[tool.hatch.build.targets.wheel]
+packages = ["masque"]
+
 [tool.hatch.version]
 path = "masque/__init__.py"