diff --git a/flake.lock b/flake.lock
index ea22bb6..543c5b2 100644
--- a/flake.lock
+++ b/flake.lock
@@ -58,11 +58,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1638959036,
-        "narHash": "sha256-d75Ow/rV3nq4penfTJz9H3/OlIHttoKoJUDEfink/8k=",
+        "lastModified": 1639430993,
+        "narHash": "sha256-hOTsN76jnikHi1358CSBubcpxreAAfmLHdUnkBYn52c=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "829e89a16f4f96428d1b94e68d4c06107b5491c0",
+        "rev": "ea5591d225c379d7b0ad594ab901bec498aefe91",
         "type": "github"
       },
       "original": {
@@ -74,17 +74,15 @@
     "neovim-flake": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "nixpkgs": "nixpkgs"
       },
       "locked": {
         "dir": "contrib",
-        "lastModified": 1639023227,
-        "narHash": "sha256-TCW5cAb7NW+cwdd+4+0CZrBc+bTvWIDrSCHS905eidY=",
+        "lastModified": 1639307139,
+        "narHash": "sha256-NqODk+iSvC5+d7YiF8wBmG4kJLxnOw3ACg1QQsBnZLs=",
         "owner": "neovim",
         "repo": "neovim",
-        "rev": "6063e07a0f50855f3e8fad38f04cd1d7f6535443",
+        "rev": "1f3c0593eb1d4e54ce1edf35da67d184807a9280",
         "type": "github"
       },
       "original": {
@@ -98,14 +96,14 @@
       "inputs": {
         "flake-compat": "flake-compat",
         "neovim-flake": "neovim-flake",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1639037648,
-        "narHash": "sha256-5Pfb0tWAsblxLBuBErxHmGhWDyS4BX2tzrZflSfpXhY=",
+        "lastModified": 1639383249,
+        "narHash": "sha256-fbJwXCA+IfqhPhlvtJoXFsOUjfLi3X7cJQgACxmIiz0=",
         "owner": "nix-community",
         "repo": "neovim-nightly-overlay",
-        "rev": "ef33381f04193f8cbc40bb8f528733d7006f9498",
+        "rev": "cfe0badfe14533bff914a55a1871f4a962609664",
         "type": "github"
       },
       "original": {
@@ -116,11 +114,11 @@
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1638440530,
-        "narHash": "sha256-kmoNW+RmSka988iWvSrkiAxO8g6D76O0gW2cIIhL6U8=",
+        "lastModified": 1639240632,
+        "narHash": "sha256-BAXhgnPOW1COIfZ9EOOFTdolalYS73MFHSRajgrSdZw=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "4c9f07277bd4bc29a051ff2a0ca58c6403e3881a",
+        "rev": "2a7063461c3751d83869a2a0a8ebc59e34bec5b2",
         "type": "github"
       },
       "original": {
@@ -132,11 +130,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1638806821,
-        "narHash": "sha256-v2qd2Bsmzft53s43eCbN+4ocrLksRdFLyF/MAGuWuDA=",
+        "lastModified": 1639347265,
+        "narHash": "sha256-q5feWoC64+h6T6J89o2HJJ8DOnB/4vwMODBlZIgeIlA=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "bc5d68306b40b8522ffb69ba6cff91898c2fbbff",
+        "rev": "b0bf5f888d377dd2f36d90340df6dc9f035aaada",
         "type": "github"
       },
       "original": {
@@ -148,11 +146,27 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1638806821,
-        "narHash": "sha256-v2qd2Bsmzft53s43eCbN+4ocrLksRdFLyF/MAGuWuDA=",
+        "lastModified": 1639256808,
+        "narHash": "sha256-RRKWi6grwe5lioKUyfZNQ4ojc5kjUTX55fPNzsGH2PY=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "e675946ecde5606c505540de2024e2732bae4185",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1639347265,
+        "narHash": "sha256-q5feWoC64+h6T6J89o2HJJ8DOnB/4vwMODBlZIgeIlA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "bc5d68306b40b8522ffb69ba6cff91898c2fbbff",
+        "rev": "b0bf5f888d377dd2f36d90340df6dc9f035aaada",
         "type": "github"
       },
       "original": {
@@ -168,7 +182,7 @@
         "home-manager": "home-manager",
         "neovim-nightly-overlay": "neovim-nightly-overlay",
         "nixos-hardware": "nixos-hardware",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs_3"
       }
     }
   },
diff --git a/machines/hephaestus/configuration.nix b/machines/hephaestus/configuration.nix
index f7afc99..8d3ea51 100644
--- a/machines/hephaestus/configuration.nix
+++ b/machines/hephaestus/configuration.nix
@@ -10,6 +10,8 @@
   hardware.nvidia.modesetting.enable = true;
   hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.legacy_470;
 
+  security.pam.u2f.enable = true;
+
   networking.hostName = "hephaestus";
 
   networking = {