diff --git a/README.md b/README.md
index 1f5793979..e19ae3059 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ $ source $HOME/.cargo/env
 $ rustup component add rustfmt-preview
 ```
 
-If your rustc version is lower than 1.31.0, please update it:
+If your rustc version is lower than 1.33.0, please update it:
 
 ```bash
 $ rustup update