--- a/Cargo.toml	Wed Dec 07 09:19:21 2022 +0200
+++ b/Cargo.toml	Sat Dec 10 16:23:58 2022 +0200
@@ -2,6 +2,7 @@
 name = "alg_tools"
 version = "0.1.0"
 edition = "2021"
+rust-version = "1.67"
 authors = ["Tuomo Valkonen <tuomov@iki.fi>"]
 description = "Utility routines for iterative numerical algorithms"
 homepage = "https://tuomov.iki.fi/software/alg_tools/"