diff --git a/apps/update-sources/src/app.ts b/apps/update-sources/src/app.ts
index bfae6379..6a68533b 100644
--- a/apps/update-sources/src/app.ts
+++ b/apps/update-sources/src/app.ts
@@ -58,9 +58,7 @@ const main = async() => {
     }
 
     if (args['m'] || args['material-rounded-theme']) {
-        console.log(runNixUpdate(
-            'scopedPackages.x86_64-linux.lovelace-components.material-rounded-theme',
-        ));
+        console.log(runNixUpdate('scopedPackages', 'lovelace-components', 'material-rounded-theme'));
     }
 
     if (args['n'] || args['node_modules']) {
@@ -68,10 +66,7 @@ const main = async() => {
     }
 
     if (args['p'] || args['pam-fprint-grosshack']) {
-        console.log(runNixUpdate(
-            'pam-fprint-grosshack',
-            ['--version="$(curl -s https://gitlab.com/api/v4/projects/mishakmak%2Fpam-fprint-grosshack/repository/tags | jq -r .[0].name)"'],
-        ));
+        console.log(runNixUpdate('pam-fprint-grosshack'));
     }
 
     if (args['ph'] || args['protonhax']) {
@@ -131,8 +126,12 @@ const main = async() => {
         // nix-update executions
         let nixUpdateOutputs = '';
 
-        const updatePackage = (pkg: string, opts: string[] = []): void => {
-            const execution = runNixUpdate(pkg, opts);
+        const updatePackage = (
+            attr: string,
+            scope?: string,
+            scopeAttr?: string,
+        ): void => {
+            const execution = runNixUpdate(attr, scope, scopeAttr);
 
             nixUpdateOutputs += execution.stdout;
             console.log(execution.stderr);
@@ -141,15 +140,10 @@ const main = async() => {
 
         updatePackage('homepage');
         updatePackage('jmusicbot');
-        updatePackage(
-            'pam-fprint-grosshack',
-            ['--version="$(curl -s https://gitlab.com/api/v4/projects/mishakmak%2Fpam-fprint-grosshack/repository/tags | jq -r .[0].name)"'],
-        );
+        updatePackage('pam-fprint-grosshack');
         updatePackage('protonhax');
         updatePackage('trash-d');
-        updatePackage(
-            'scopedPackages.x86_64-linux.lovelace-components.material-rounded-theme',
-        );
+        updatePackage('scopedPackages', 'lovelace-components', 'material-rounded-theme');
 
 
         spawnSync('nixFastBuild', [], {
diff --git a/apps/update-sources/src/misc.ts b/apps/update-sources/src/misc.ts
index c448dc24..76120391 100644
--- a/apps/update-sources/src/misc.ts
+++ b/apps/update-sources/src/misc.ts
@@ -54,21 +54,36 @@ const getAttrVersion = (attr: string): string => spawnSync('nix',
 
 export const runNixUpdate = (
     attr: string,
-    options: string[] = [],
+    scope?: string,
+    scopeAttr?: string,
 ): { stdout: string, stderr: string } => {
-    const OLD_VERSION = getAttrVersion(attr);
+    const realAttr = scope ? `${attr}.x86_64-linux.${scope}.${scopeAttr}` : attr;
+    const OLD_VERSION = getAttrVersion(realAttr);
 
-    const execution = spawnSync(
-        `nix-update --flake ${attr} ${options
-            .join(' ')} --write-commit-message >(head -n 1 -) > /dev/null`,
+    const execOptions = spawnSync(
+        `nix eval --json ${FLAKE}#${realAttr}.updateScript`,
         [],
         { shell: true, cwd: FLAKE },
     );
 
-    const NEW_VERSION = getAttrVersion(attr);
+    const options = execOptions.status === 0 ?
+        Array(JSON.parse(execOptions.stdout.toString()))[0].slice(1).join(' ') :
+        '';
+
+    const execution = spawnSync(
+        `nix-update --flake ${realAttr} ${options} --write-commit-message >(head -n 1 -) > /dev/null`,
+        [],
+        { shell: true, cwd: FLAKE },
+    );
+
+    const NEW_VERSION = getAttrVersion(realAttr);
 
     return {
-        stdout: OLD_VERSION !== NEW_VERSION ? execution.stdout.toString() : '',
+        stdout: OLD_VERSION !== NEW_VERSION ?
+            scope ?
+                execution.stdout.toString().replaceAll(`${attr}.x86_64-linux.${scope}.`, '') :
+                execution.stdout.toString() :
+            '',
         stderr: execution.stderr.toString(),
     };
 };
diff --git a/packages/pam-fprint-grosshack/default.nix b/packages/pam-fprint-grosshack/default.nix
index a87eee8a..dd01b1d6 100644
--- a/packages/pam-fprint-grosshack/default.nix
+++ b/packages/pam-fprint-grosshack/default.nix
@@ -3,6 +3,7 @@
   lib,
   stdenv,
   fetchFromGitLab,
+  nix-update-script,
   # deps
   dbus,
   glib,
@@ -70,6 +71,12 @@ in
       "-Dsystemd_system_unit_dir=${placeholder "out"}/lib/systemd/system"
     ];
 
+    passthru.updateScript = nix-update-script {
+      extraArgs = [
+        ''--version=$(curl -s https://gitlab.com/api/v4/projects/mishakmak%2Fpam-fprint-grosshack/repository/tags | jq -r .[0].name)''
+      ];
+    };
+
     meta = {
       license = with lib.licenses; [gpl2Plus];
       homepage = "https://gitlab.com/mishakmak/pam-fprint-grosshack";