diff --git a/flake.lock b/flake.lock
index 9f1c842..19a700d 100644
--- a/flake.lock
+++ b/flake.lock
@@ -8,11 +8,11 @@
         "pre-commit-hooks": "pre-commit-hooks"
       },
       "locked": {
-        "lastModified": 1689785879,
-        "narHash": "sha256-ofTzITQUNKiA2RBE7hLChVguua4AoHrr1TSvQyTzQ6Q=",
+        "lastModified": 1689890200,
+        "narHash": "sha256-RhG3twdQjaNFgvUxdIJ+9ynu7oeEs/h65fxDvcmTuSQ=",
         "owner": "cachix",
         "repo": "devenv",
-        "rev": "e207a8ef9911eba7f9a5e7761e47dc532931d482",
+        "rev": "f9f4dd3c1a4f767b11abe092b1ecdcf27844a2bd",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 10709cf..36f5dd6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -24,16 +24,13 @@
           modules = [
             {
               # https://devenv.sh/reference/options/
-              packages = [pkgs.hello pkgs.delta pkgs.difftastic pkgs.alejandra pkgs.nodePackages.bash-language-server];
-
-              enterShell = ''
-                hello
-              '';
+              packages = [pkgs.hello pkgs.delta pkgs.difftastic pkgs.alejandra pkgs.nodePackages.bash-language-server pkgs.shellcheck pkgs.shfmt];
 
               pre-commit.hooks = {
-                shellcheck.enable = true;
-                black.enable = true;
                 alejandra.enable = true;
+                black.enable = true;
+                shellcheck.enable = true;
+                shfmt.enable = true;
                 taplo.enable = true;
               };
             }
diff --git a/nix/home-manager/flake.lock b/nix/home-manager/flake.lock
index 0e8f7fe..2d1f694 100644
--- a/nix/home-manager/flake.lock
+++ b/nix/home-manager/flake.lock
@@ -118,11 +118,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1689875525,
-        "narHash": "sha256-fgUrFH3bMZ6R7qgBTfuTRGlkZXIkdyjndl6ZbExbjE8=",
+        "lastModified": 1689891262,
+        "narHash": "sha256-Pc4wDczbdgd6QXKJIXprgxe7L9AVDsoAkMnvm5vmpUU=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "1443abd2696ec6bd6fb9701e6c26b277a27b4a3e",
+        "rev": "ee5673246de0254186e469935909e821b8f4ec15",
         "type": "github"
       },
       "original": {
diff --git a/nix/setup.sh b/nix/setup.sh
index 2b6a991..a232ec9 100755
--- a/nix/setup.sh
+++ b/nix/setup.sh
@@ -1,6 +1,7 @@
+#!/bin/bash
 if [[ ! -x $(command -v nix) ]]; then
-    echo "make sure to install nix"
-    exit 1
+	echo "make sure to install nix"
+	exit 1
 fi
 
 nix-channel --add https://github.com/nix-community/home-manager/archive/master.tar.gz home-manager
@@ -10,11 +11,11 @@ nix-shell '<home-manager>' -A install
 
 nix flake update
 if [[ $(uname) == "Darwin" ]]; then
-    # we're modern macOS
-    home-manager switch --flake "$PWD/home-manager#aarch64-darwin-acicchetti"
+	# we're modern macOS
+	home-manager switch --flake "$PWD/home-manager#aarch64-darwin-acicchetti"
 else
-    # we're linux
-    home-manager switch --flake "$PWD/home-manager#x86_64-linux-acicchetti"
+	# we're linux
+	home-manager switch --flake "$PWD/home-manager#x86_64-linux-acicchetti"
 fi
 
 git clone https://github.com/doomemacs/doomemacs ~/.emacs.d
diff --git a/nix/update.sh b/nix/update.sh
index 963a3f5..1a56339 100755
--- a/nix/update.sh
+++ b/nix/update.sh
@@ -1,12 +1,34 @@
 #!/bin/bash
-pushd ~/.dotfiles
-printf "Updating \033[38;5;87mdevenv\033[0m \n"
-nix flake update
-pushd ./nix/home-manager
-printf "Updating \033[38;5;87mhome-manager\033[0m\n"
-nix flake update
-if [[ $(uname) == "Darwin" ]]; then
-	home-manager switch --flake ".#aarch64-darwin-acicchetti"
-else
-	home-manager switch --flake '.#x86_64-linux-acicchetti'
-fi
+do_devenv() {
+	pushd ~/.dotfiles || return
+	printf "Updating \033[38;5;87mdevenv\033[0m \n"
+	nix flake update
+	popd || return
+}
+do_home_manager() {
+	pushd ./home-manager || return
+	printf "Updating \033[38;5;87mhome-manager\033[0m\n"
+	nix flake update
+	if [[ $(uname) == "Darwin" ]]; then
+		home-manager switch --flake ".#aarch64-darwin-acicchetti"
+	else
+		home-manager switch --flake '.#x86_64-linux-acicchetti'
+	fi
+	popd || return
+}
+
+OPTIND=1
+while getopts dh opt; do
+	case $opt in
+	d)
+		do_devenv
+		;;
+	h)
+		do_home_manager
+		;;
+	*)
+		exit 1
+		;;
+	esac
+done
+shift "$((OPTIND - 1))" # Discard the options and sentinel --