diff --git a/Cargo.toml b/Cargo.toml
index b017d67..c432664 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,8 @@
 [package]
 name = "sitewriter"
-version = "0.4.1"
+version = "0.4.2"
 authors = ["Edgar <git@edgarluque.com>"]
-edition = "2018"
+edition = "2021"
 description = "A sitemap writing library."
 readme = "README.md"
 documentation = "https://docs.rs/sitewriter"