diff --git a/home/zsh.nix b/home/zsh.nix
index 640db01..cb2a504 100644
--- a/home/zsh.nix
+++ b/home/zsh.nix
@@ -45,6 +45,7 @@
         tree = "exa --tree --icons";
         s = "nix-shell --run zsh";
         sp = "nix-shell --run zsh -p";
+        spu = "nix-shell -I nixpkgs=channel:nixos-unstable --run zsh -p";
         em = "emacsclient -c";
         emnw = "emacsclient -nw";
         gst = "git status -sb";