diff --git a/packages/configuration.nix b/packages/configuration.nix
index 00e84a9..74d6ca9 100644
--- a/packages/configuration.nix
+++ b/packages/configuration.nix
@@ -13,10 +13,10 @@ with lib;
   environment.systemPackages = with pkgs; [
     # Urchin
     bash dash mksh zsh
-    # busybox
+    busybox
 
     # Other
-    vim git rsync
+    vim git rsync tmux
   ];
   services.openssh = {
     enable = true;
diff --git a/packages/nixos-container.sh b/packages/nixos-container.sh
index 74ea689..9b74d5b 100755
--- a/packages/nixos-container.sh
+++ b/packages/nixos-container.sh
@@ -9,7 +9,7 @@ fi
 # Configure the container.
 sudo cp configuration.nix \
   /var/lib/containers/urchin/etc/nixos/configuration.nix
-nixos-container update urchin
+sudo nixos-container update urchin
 
 # Create the git repository.
 host="tlevine@$(nixos-container show-ip urchin)"