diff --git a/Makefile b/Makefile
index bec410a..89ad1c0 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ clean:
 	- rm -rf ffn.egg-info
 
 dist:
-	python -m build
+	python -m build -s
 	python -m twine check dist/*
 
 upload: clean dist
diff --git a/ffn/__init__.py b/ffn/__init__.py
index 2619cd5..49f3024 100644
--- a/ffn/__init__.py
+++ b/ffn/__init__.py
@@ -8,4 +8,4 @@
 
 core.extend_pandas()
 
-__version__ = "0.3.9"
+__version__ = "0.4.0"
diff --git a/pyproject.toml b/pyproject.toml
index a1da4f6..fabf10a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ requires = ["setuptools", "wheel"]
 [project]
 name = "ffn"
 description = "Financial functions for Python"
-version = "0.3.9"
+version = "0.4.0"
 readme = "README.md"
 license = { file = "LICENSE.txt" }
 requires-python = ">=3.8"