diff --git a/Cargo.toml b/Cargo.toml
index ed0255b..86442b8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name        = "ordered-float"
-version     = "3.9.1"
+version     = "4.0.0"
 authors     = [
   "Jonathan Reem <jonathan.reem@gmail.com>",
   "Matt Brubeck <mbrubeck@limpet.net>",
@@ -12,6 +12,7 @@ readme      = "README.md"
 keywords    = ["no_std", "ord", "f64", "f32", "sort"]
 categories  = ["science", "rust-patterns", "no-std"]
 edition     = "2021"
+rust-version = "1.60"
 
 [dependencies]
 num-traits = { version = "0.2.1", default-features = false }