diff --git a/flake.lock b/flake.lock
index b82f715..24d84e8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -190,11 +190,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1707919853,
-        "narHash": "sha256-qxmBGDzutuJ/tsX4gp+Mr7fjxOZBbeT9ixhS5o4iFOw=",
+        "lastModified": 1708031129,
+        "narHash": "sha256-EH20hJfNnc1/ODdDVat9B7aKm0B95L3YtkIRwKLvQG8=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "043ba285c6dc20f36441d48525402bcb9743c498",
+        "rev": "3d6791b3897b526c82920a2ab5f61d71985b3cf8",
         "type": "github"
       },
       "original": {
@@ -226,7 +226,7 @@
     "mac-brcm-fw": {
       "flake": false,
       "locked": {
-        "lastModified": 1701034142,
+        "lastModified": 1701030348,
         "narHash": "sha256-+kW8ogc6DykjMVlrr+3vWKs9ZUdJ9EW72LbY7k/Qvh4=",
         "path": "/home/jade/nix-configs/mac-brcm-fw",
         "type": "path"
@@ -345,11 +345,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1707786466,
-        "narHash": "sha256-yLPfrmW87M2qt+8bAmwopJawa+MJLh3M9rUbXtpUc1o=",
+        "lastModified": 1708161998,
+        "narHash": "sha256-6KnemmUorCvlcAvGziFosAVkrlWZGIc6UNT9GUYr0jQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "01885a071465e223f8f68971f864b15829988504",
+        "rev": "84d981bae8b5e783b3b548de505b22880559515f",
         "type": "github"
       },
       "original": {
@@ -466,11 +466,11 @@
     },
     "nixpkgs_8": {
       "locked": {
-        "lastModified": 1707689078,
-        "narHash": "sha256-UUGmRa84ZJHpGZ1WZEBEUOzaPOWG8LZ0yPg1pdDF/yM=",
+        "lastModified": 1708118438,
+        "narHash": "sha256-kk9/0nuVgA220FcqH/D2xaN6uGyHp/zoxPNUmPCMmEE=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f9d39fb9aff0efee4a3d5f4a6d7c17701d38a1d8",
+        "rev": "5863c27340ba4de8f83e7e3c023b9599c3cb3c80",
         "type": "github"
       },
       "original": {
diff --git a/hosts/monosodium-glutamate-g/configuration.nix b/hosts/monosodium-glutamate-g/configuration.nix
index 366dd4f..7010b36 100644
--- a/hosts/monosodium-glutamate-g/configuration.nix
+++ b/hosts/monosodium-glutamate-g/configuration.nix
@@ -82,6 +82,16 @@
     enableRedistributableFirmware = true;
   };
 
+  security.pam.services.jade.u2fAuth = true;
+  programs.i3lock.u2fSupport = true;
+
+  security.pam.u2f = {
+    enable = true;
+    cue = true;
+    control = "sufficient";
+    authFile = "/home/jade/.ssh/u2f_keys";
+  };
+
   # missing: menu-qalc picom-jonaburg
   environment.systemPackages = with pkgs; [
     # TODO: clean up.