diff --git a/flake.nix b/flake.nix
index d232bfa..1e84d67 100644
--- a/flake.nix
+++ b/flake.nix
@@ -129,6 +129,7 @@
             nativeBuildInputs = with pkgs; [
               cargo-audit
               cargo-release
+              cargo-msrv
               rustfmt
               nodePackages.prettier
               nushell # for the .ci/gen-workflow-files.nu script