diff --git a/Cargo.toml b/Cargo.toml
index 691542d..dc88e20 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ readme = "Readme.md"
 license = "MIT"
 version = "5.1.0" # remember to update html_root_url
 authors = ["Tristan Hume <tristan@thume.ca>"]
-edition = "2018"
+edition = "2021"
 exclude = [
     "testdata/*",
     "/scripts/*",