diff --git a/Cargo.toml b/Cargo.toml
index 7d2d3f4..d455554 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "quanta"
-version = "0.4.1"
+version = "0.4.2-alpha.0"
 authors = ["Toby Lawrence <tlawrence@nuclearfurnace.com>"]
 edition = "2018"