diff --git a/Cargo.toml b/Cargo.toml
index 2e6a4cd..5c47ea2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2018"
 # - Update html_root_url
 # - Update CHANGELOG.md
 # - Create git tag.
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Henry de Valence <hdevalence@hdevalence.ca>", "Deirdre Connolly <durumcrustulum@gmail.com>", "Chelsea Komlo <me@chelseakomlo.com>"]
 readme = "README.md"
 license = "MIT OR Apache-2.0"