diff --git a/flake.lock b/flake.lock
index be91cc1..74d34c3 100644
--- a/flake.lock
+++ b/flake.lock
@@ -10,11 +10,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1716561646,
-        "narHash": "sha256-UIGtLO89RxKt7RF2iEgPikSdU53r6v/6WYB0RW3k89I=",
+        "lastModified": 1707830867,
+        "narHash": "sha256-PAdwm5QqdlwIqGrfzzvzZubM+FXtilekQ/FA0cI49/o=",
         "owner": "ryantm",
         "repo": "agenix",
-        "rev": "c2fc0762bbe8feb06a2e59a364fa81b3a57671c9",
+        "rev": "8cb01a0e717311680e0cbca06a76cbceba6f3ed6",
         "type": "github"
       },
       "original": {
@@ -32,11 +32,11 @@
         "nixpkgs-stable": "nixpkgs-stable"
       },
       "locked": {
-        "lastModified": 1711742460,
-        "narHash": "sha256-0O4v6e4a1toxXZ2gf5INhg4WPE5C5T+SVvsBt+45Mcc=",
+        "lastModified": 1707922053,
+        "narHash": "sha256-wSZjK+rOXn+UQiP1NbdNn5/UW6UcBxjvlqr2wh++MbM=",
         "owner": "zhaofengli",
         "repo": "attic",
-        "rev": "4dbdbee45728d8ce5788db6461aaaa89d98081f0",
+        "rev": "6eabc3f02fae3683bffab483e614bebfcd476b21",
         "type": "github"
       },
       "original": {
@@ -55,11 +55,11 @@
         "stable": "stable"
       },
       "locked": {
-        "lastModified": 1711386353,
-        "narHash": "sha256-gWEpb8Hybnoqb4O4tmpohGZk6+aerAbJpywKcFIiMlg=",
+        "lastModified": 1706509311,
+        "narHash": "sha256-QQKQ6r3CID8aXn2ZXZ79ZJxdCOeVP+JTnOctDALErOw=",
         "owner": "zhaofengli",
         "repo": "colmena",
-        "rev": "cd65ef7a25cdc75052fbd04b120aeb066c3881db",
+        "rev": "c84ccd0a7a712475e861c2b111574472b1a8d0cd",
         "type": "github"
       },
       "original": {
@@ -118,11 +118,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1716431128,
-        "narHash": "sha256-t3T8HlX3udO6f4ilLcN+j5eC3m2gqsouzSGiriKK6vk=",
+        "lastModified": 1709439398,
+        "narHash": "sha256-MW0zp3ta7SvdpjvhVCbtP20ewRwQZX2vRFn14gTc4Kg=",
         "owner": "nix-community",
         "repo": "disko",
-        "rev": "7ffc4354dfeb37c8c725ae1465f04a9b45ec8606",
+        "rev": "1f76b318aa11170c8ca8c225a9b4c458a5fcbb57",
         "type": "github"
       },
       "original": {
@@ -170,11 +170,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1715865404,
-        "narHash": "sha256-/GJvTdTpuDjNn84j82cU6bXztE0MSkdnTWClUCRub78=",
+        "lastModified": 1709336216,
+        "narHash": "sha256-Dt/wOWeW6Sqm11Yh+2+t0dfEWxoMxGBvv3JpIocFl9E=",
         "owner": "hercules-ci",
         "repo": "flake-parts",
-        "rev": "8dc45382d5206bd292f9c2768b8058a8fd8311d9",
+        "rev": "f7b3c975cf067e56e7cda6cb098ebe3fb4d74ca2",
         "type": "github"
       },
       "original": {
@@ -257,27 +257,27 @@
         ]
       },
       "locked": {
-        "lastModified": 1717527182,
-        "narHash": "sha256-vWSkg6AMok1UUQiSYVdGMOXKD2cDFnajITiSi0Zjd1A=",
+        "lastModified": 1706981411,
+        "narHash": "sha256-cLbLPTL1CDmETVh4p0nQtvoF+FSEjsnJTFpTxhXywhQ=",
         "owner": "rycee",
         "repo": "home-manager",
-        "rev": "845a5c4c073f74105022533907703441e0464bc3",
+        "rev": "652fda4ca6dafeb090943422c34ae9145787af37",
         "type": "github"
       },
       "original": {
         "owner": "rycee",
-        "ref": "release-24.05",
+        "ref": "release-23.11",
         "repo": "home-manager",
         "type": "github"
       }
     },
     "nixos-hardware": {
       "locked": {
-        "lastModified": 1716715385,
-        "narHash": "sha256-fe6Z33pbfqu4TI5ijmcaNc5vRBs633tyxJ12HTghy3w=",
+        "lastModified": 1709410583,
+        "narHash": "sha256-esOSUoQ7mblwcsSea0K17McZuwAIjoS6dq/4b83+lvw=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "2e7d6c568063c83355fe066b8a8917ee758de1b8",
+        "rev": "59e37017b9ed31dee303dbbd4531c594df95cfbc",
         "type": "github"
       },
       "original": {
@@ -288,11 +288,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1711401922,
-        "narHash": "sha256-QoQqXoj8ClGo0sqD/qWKFWezgEwUL0SUh37/vY2jNhc=",
+        "lastModified": 1702539185,
+        "narHash": "sha256-KnIRG5NMdLIpEkZTnN5zovNYc0hhXjAgv6pfd5Z4c7U=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "07262b18b97000d16a4bdb003418bd2fb067a932",
+        "rev": "aa9d4729cbc99dabacb50e3994dcefb3ea0f7447",
         "type": "github"
       },
       "original": {
@@ -304,11 +304,11 @@
     },
     "nixpkgs-stable": {
       "locked": {
-        "lastModified": 1711460390,
-        "narHash": "sha256-akSgjDZL6pVHEfSE6sz1DNSXuYX6hq+P/1Z5IoYWs7E=",
+        "lastModified": 1702780907,
+        "narHash": "sha256-blbrBBXjjZt6OKTcYX1jpe9SRof2P9ZYWPzq22tzXAA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "44733514b72e732bd49f5511bd0203dea9b9a434",
+        "rev": "1e2e384c5b7c50dbf8e9c441a9e58d85f408b01f",
         "type": "github"
       },
       "original": {
@@ -320,11 +320,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1716715802,
-        "narHash": "sha256-usk0vE7VlxPX8jOavrtpOqphdfqEQpf9lgedlY/r66c=",
+        "lastModified": 1709356872,
+        "narHash": "sha256-mvxCirJbtkP0cZ6ABdwcgTk0u3bgLoIoEFIoYBvD6+4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e2dd4e18cc1c7314e24154331bae07df76eb582f",
+        "rev": "458b097d81f90275b3fdf03796f0563844926708",
         "type": "github"
       },
       "original": {
@@ -336,27 +336,27 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1717796960,
-        "narHash": "sha256-BKjQ9tQdsuoROrojHZb7KTAv95WprqCkNFvuzatfEo0=",
-        "owner": "NixOS",
+        "lastModified": 1716330751,
+        "narHash": "sha256-JLvLi84gRMwgF9DumUwiOUA5UciXf9e2Aaa07sKx4Y0=",
+        "owner": "pennae",
         "repo": "nixpkgs",
-        "rev": "8e0a5f16b7bf7f212be068dd302c49888c6ad68f",
+        "rev": "8e505de834edbac6d581589ebd18339c38d32731",
         "type": "github"
       },
       "original": {
-        "owner": "NixOS",
-        "ref": "nixos-24.05-small",
+        "owner": "pennae",
         "repo": "nixpkgs",
+        "rev": "8e505de834edbac6d581589ebd18339c38d32731",
         "type": "github"
       }
     },
     "nur": {
       "locked": {
-        "lastModified": 1716741358,
-        "narHash": "sha256-4bxptwbmplGKq3W4tl6Zem/bOHsdLP4DSPcm/FfCaFE=",
+        "lastModified": 1709439575,
+        "narHash": "sha256-49f8WbTUE4C8VrIxS2DrINOncakhFChcmZ6xccVSfkA=",
         "owner": "nix-community",
         "repo": "NUR",
-        "rev": "c65a3bde6793b437a705edfe5ff8435cbb8307a2",
+        "rev": "075c3094d6c6c3fae0e107de41e2367d17341ac4",
         "type": "github"
       },
       "original": {
@@ -388,11 +388,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1716425501,
-        "narHash": "sha256-BSLhmGYY1khyyBAjraR+N0Pa9Nha/et5yQQlEZxcfkU=",
+        "lastModified": 1709301784,
+        "narHash": "sha256-Yf7HeS2VZCD8kD/wEgnToyt9YqQhCle/9TazmFYnjsE=",
         "owner": "numtide",
         "repo": "srvos",
-        "rev": "1122cd50a23647e09c3e7a679d37ec02113bc412",
+        "rev": "9501896e0edf01d2cbd5fa6f0dbb3aafc00dae81",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 779165c..06af59b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,13 +10,13 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
     flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
 
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05-small";
+    nixpkgs.url = "github:pennae/nixpkgs/8e505de834edbac6d581589ebd18339c38d32731";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
     nixos-hardware.url = "github:NixOS/nixos-hardware";
     nur.url = "github:nix-community/NUR";
 
-    home-manager.url = "github:rycee/home-manager/release-24.05";
+    home-manager.url = "github:rycee/home-manager/release-23.11";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
 
     agenix.url = "github:ryantm/agenix";
diff --git a/modules/nix-daemon.nix b/modules/nix-daemon.nix
index 59e7ac5..b30d12d 100644
--- a/modules/nix-daemon.nix
+++ b/modules/nix-daemon.nix
@@ -31,11 +31,7 @@ in
     ];
 
     # Makes the computer go faster.
-    # nixos.jobserver.enable = true;
-    # TODO(raito): rework this.
-
-    # Avoid weird failures for builders.
-    services.openssh.settings.MaxStartups = 100;
+    nixos.jobserver.enable = true;
 
     # Memory accounting techniques
     systemd.services.nix-daemon.serviceConfig = {
diff --git a/modules/users/admins.nix b/modules/users/admins.nix
index eb2794c..e3ae6ea 100644
--- a/modules/users/admins.nix
+++ b/modules/users/admins.nix
@@ -22,6 +22,7 @@ in
       luj = {
         isNormalUser = true;
         home = "/home/luj";
+        inherit (config.users.users.raito);
         extraGroups = extraGroups ++ [ "production-hydra-db" ];
         shell = "/run/current-system/sw/bin/zsh";
         uid = 1001;