diff --git a/sysvmq/Cargo.toml b/sysvmq/Cargo.toml
index e4eb0e0..5f8c435 100644
--- a/sysvmq/Cargo.toml
+++ b/sysvmq/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "sysvmq"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 authors = ["finga <mqrs@onders.org>"]
 repository = "https://git.onders.org/finga/mqrs"
 license = "GPL-3.0-or-later"