diff --git a/nixos/default.nix b/nixos/default.nix
index dd36637c..b89ce662 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -54,6 +54,7 @@
     e2fsprogs    # disk format utilities, like mkfs.ext4
     bat          # Like cat, but with syntax highlighting
     openssl      # Used to generate certs, random strings, etc
+    tree         # CLI directory display software
   ];
 
   # Select internationalisation properties.
diff --git a/wallpapers b/wallpapers
index 1de3f3a1..dc108595 160000
--- a/wallpapers
+++ b/wallpapers
@@ -1 +1 @@
-Subproject commit 1de3f3a19978f0b00ede6670c5027497a43beea8
+Subproject commit dc1085957c1750128f3c607cc2d480f0d183de56