diff --git a/Cargo.toml b/Cargo.toml
index 12f8388..622f3eb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,3 +3,4 @@ name = "alias_to_sieve"
 version = "0.1.0"
 edition = "2021"
 
+rust-version = "1.68.2"