diff --git a/embedded/rust/arduino/book.toml b/embedded/rust/arduino/book.toml
index a1079f6..0e8150a 100644
--- a/embedded/rust/arduino/book.toml
+++ b/embedded/rust/arduino/book.toml
@@ -4,3 +4,6 @@ language = "zh_cn"
 multilingual = false
 src = "src"
 title = "使用Rust进行Arduino开发"
+
+[rust]
+edition="2021"