diff --git a/README.md b/README.md
index 49ac4e8..8db0326 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ a CalDAV/CardDAV server
 ### Manual
 
 ```sh
-cargo install --git https://github.com/lennart-k/rustical
+cargo install --locked --git https://github.com/lennart-k/rustical
 ```
 
 ### Docker