diff --git a/Cargo.toml b/Cargo.toml
index 055590f..496dba6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "rpn_rs"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Austen Adler <agadler@austenadler.com>"]
 edition = "2018"
 readme = "README.adoc"