diff --git a/Cargo.toml b/Cargo.toml
index 81e32bb..f3f5d5d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "hoc"
 version = "0.32.0"
 authors = ["Valentin Brandl <vbrandl@riseup.net>"]
-edition = "2018"
+edition = "2021"
 build = "build.rs"
 
 [lib]