diff --git a/api/README.md b/api/README.md
index 8979cd542..f83f990b1 100644
--- a/api/README.md
+++ b/api/README.md
@@ -6,7 +6,7 @@ enabled. To create these files run `../contrib/check-for-api-changes.sh`:
 Requires `cargo-public-api`, install with:
 
 ```
-cargo +stable install cargo-public-api --locked
+cargo +nightly install cargo-public-api --locked
 ```
 
 ref: https://github.com/enselic/cargo-public-api