diff --git a/pyproject.toml b/pyproject.toml
index bf135807..09dcae5c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "speedwagon"
-version = "0.4.0.dev9"
+version = "0.4.0b9"
 description = "Collection of tools and workflows for DS"
 maintainers = [
     { name="Henry Borchers", email="hborcher@illinois.edu" }