diff --git a/README.md b/README.md
index 6e3348b..ac196fb 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ website, [iamb.chat].
 
 ## Installation
 
-Install Rust and Cargo, and then run:
+Install Rust (1.66.0 or above) and Cargo, and then run:
 
 ```
 cargo install --locked iamb