diff --git a/Cargo.toml b/Cargo.toml
index 2503038..ba69da8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "http-sig"
 description = "Implementation of the IETF draft 'Signing HTTP Messages'"
-version = "0.3.1"
+version = "0.4.0"
 authors = ["Jack Cargill <jack@passfort.com>", "Diggory Blake"]
 edition = "2018"
 readme = "README.md"