diff --git a/third_party/nixpkgs/default.nix b/third_party/nixpkgs/default.nix
index 27a5a8673..5afed93e4 100644
--- a/third_party/nixpkgs/default.nix
+++ b/third_party/nixpkgs/default.nix
@@ -13,16 +13,16 @@ let
   # nixos-unstable, and the current stable channel of the latest NixOS
   # release.
 
-  # Tracking nixos-unstable as of 2022-01-15.
+  # Tracking nixos-unstable as of 2022-01-27.
   unstableHashes = {
-    commit = "5aaed40d22f0d9376330b6fa413223435ad6fee5";
-    sha256 = "0bs8sr92lzz7mdrlv143draq3j7l42dj69w3px1x31qcr3n5pgcv";
+    commit = "945ec499041db73043f745fad3b2a3a01e826081";
+    sha256 = "1ixv310sjw0r5vda4yfwp3snyha2i9h7aqygd43cyvdk2qsjk8pq";
   };
 
-  # Tracking nixos-21.11 as of 2022-01-16.
+  # Tracking nixos-21.11 as of 2022-01-26.
   stableHashes = {
-    commit = "3ddd960a3b575bf3230d0e59f42614b71f9e0db9";
-    sha256 = "1sk60h584gfdf5ql3mv4hps6jly6yj6dc5fbkfkh082z1c8885vk";
+    commit = "b3d86c56c786ad9530f1400adbd4dfac3c42877b";
+    sha256 = "09nslcjdgwwb6j9alxrsnq1wvhifq1nmzl2w02l305j0wsmgdial";
   };
 
   # import the nixos-unstable package set, or optionally use the
diff --git a/third_party/terraform-provider-glesys/default.nix b/third_party/terraform-provider-glesys/default.nix
index a944af34f..51582fd60 100644
--- a/third_party/terraform-provider-glesys/default.nix
+++ b/third_party/terraform-provider-glesys/default.nix
@@ -3,21 +3,17 @@
 # Some TVL resources (DNS, object storage, ...) are hosted with them.
 { pkgs, ... }:
 
-pkgs.buildGoModule rec {
-  pname = "terraform-provider-glesys";
+pkgs.terraform-providers.mkProvider rec {
   version = "0.3.1";
 
-  src = pkgs.fetchFromGitHub {
-    owner = "glesys";
-    repo = pname;
-    rev = "v${version}";
-    sha256 = "1rcwzf31gdxjywkcnlq1nxv4y8fcrc2z2xrp73q61mglv01bqq8m";
-  };
+  owner = "glesys";
+  repo = "terraform-provider-glesys";
+  rev = "v${version}";
+  sha256 = "1rcwzf31gdxjywkcnlq1nxv4y8fcrc2z2xrp73q61mglv01bqq8m";
 
   vendorSha256 = "0g5g69absf0vmin0ff0anrxcgfq0bzx4iz3qci90p9xkvyph4nlw";
-  postInstall = "mv $out/bin/${pname}{,_v${version}}";
 
   # This provider is not officially published in the TF registry, so
   # we're giving it a fake source here.
-  passthru.provider-source-address = "registry.terraform.io/depot/glesys";
+  provider-source-address = "registry.terraform.io/depot/glesys";
 }
diff --git a/users/grfn/system/home/modules/games.nix b/users/grfn/system/home/modules/games.nix
index da54f99e5..26dc9d31f 100644
--- a/users/grfn/system/home/modules/games.nix
+++ b/users/grfn/system/home/modules/games.nix
@@ -53,7 +53,7 @@ in mkMerge [
   (mkIf stdenv.isLinux {
     home.packages = [
       df
-      multimc
+      polymc
     ];
   })
 ]