diff --git a/Cargo.toml b/Cargo.toml
index 36b67c2..7349da3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,10 +4,10 @@ description = "impl GlobalAlloc for bdwgc"
 version = "0.6.0"
 authors = [
   "swgillespie <sean.william.g@gmail.com>",
-  "Yota Toyama <raviqqe@gmail.com>"
+  "Yota Toyama <raviqqe@gmail.com>",
 ]
 repository = "https://github.com/raviqqe/bdwgc-alloc"
-edition = "2018"
+edition = "2021"
 license = "MIT"
 build = "build.rs"