diff --git a/README.md b/README.md
index 3c07ffe..43abf39 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@
 [rust-mdbook]: https://github.com/rust-lang/rust/blob/master/src/tools/rustbook/Cargo.toml
 
 ```bash
-$ cargo install mdbook --vers [version-num]
+$ cargo install mdbook --locked --vers [version-num]
 ```
 
 ## 构建