diff --git a/nix/alex-desktop.nix b/nix/alex-desktop.nix
index 2cafd6b..2932147 100644
--- a/nix/alex-desktop.nix
+++ b/nix/alex-desktop.nix
@@ -160,6 +160,11 @@
     };
   };
 
+  # fingerprint
+  services.fprintd.enable = true;
+  security.pam.services.sudo.fprintAuth = true;
+  security.pam.services.gdm.fprintAuth = true;
+
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions
   # on your system were taken. It‘s perfectly fine and recommended to leave