diff --git a/mill-scale.nix b/mill-scale.nix
index 3dad799..880695b 100644
--- a/mill-scale.nix
+++ b/mill-scale.nix
@@ -144,7 +144,7 @@ in
       };
       semverToolchain = mkOption {
         type = function;
-        default = pkgs: pkgs.rust-bin.stable."1.86.0".default;
+        default = pkgs: pkgs.rust-bin.stable."1.89.0".default;
         description = "rust toolchain to use for cargo-semver-checks";
       };
       miriToolchain = mkOption {