diff --git a/Cargo.toml b/Cargo.toml
index 3ca39d7..fbfba22 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Thomas Forgione <thomas@tforgione.fr>"]
 
 [dependencies]
-rand = "*"
+rand = "0.4.2"
 
 [[bin]]
 name = "example"