diff --git a/Cargo.toml b/Cargo.toml
index 7e8d26f..b21194b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,6 +3,7 @@ name = "similar"
 version = "2.1.0"
 authors = ["Armin Ronacher <armin.ronacher@active-4.com>", "Pierre-Étienne Meunier <pe@pijul.org>", "Brandon Williams <bwilliams.eng@gmail.com>"]
 edition = "2018"
+rust-version = "1.41"
 license = "Apache-2.0"
 description = "A diff library for Rust"
 repository = "https://github.com/mitsuhiko/similar"