diff --git a/configs/packages/default.nix b/configs/packages/default.nix
index 6a48d05..794307b 100644
--- a/configs/packages/default.nix
+++ b/configs/packages/default.nix
@@ -1,5 +1,7 @@
-{ pkgs, lib, ... }: 
-let hc = pkgs.callPackage <stockholm/tv/5pkgs/simple/hc.nix> {};
+{ pkgs, lib, ... }:
+let
+  hc = pkgs.callPackage <stockholm/tv/5pkgs/simple/hc.nix> {};
+  inherit (import <niveum/lib>) nixpkgs-unstable;
 in {
   imports = [
     ./krebs.nix
@@ -97,7 +99,7 @@ in {
     audacity
     calibre
     inkscape
-    zoom-us # video conferencing
+    nixpkgs-unstable.zoom-us # video conferencing
     pdfgrep # search in pdf
     pdftk # pdf toolkit
     evince # for viewing pdf annotations
diff --git a/configs/packages/writing.nix b/configs/packages/writing.nix
index 813b6ba..e305b97 100644
--- a/configs/packages/writing.nix
+++ b/configs/packages/writing.nix
@@ -2,8 +2,6 @@
 let
   inherit (import <niveum/lib>) nixpkgs-unstable;
 
-  unstable = import nixpkgs-unstable {};
-
   zoteroStyle = { name, sha256 }: {
     name = "${name}.csl";
     path = pkgs.fetchurl {
@@ -70,7 +68,7 @@ in {
     libreoffice
     # gnumeric
     dia
-    unstable.pandoc
+    nixpkgs-unstable.pandoc
     # proselint
     asciidoctor
     wordnet
diff --git a/lib/default.nix b/lib/default.nix
index 96117c2..7796b1a 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -1,8 +1,9 @@
-{
-  nixpkgs-unstable = builtins.fetchGit {
+rec {
+  nixpkgs-src = builtins.fetchGit {
     url = "https://github.com/NixOS/nixpkgs";
-    rev = "c40f06022a83d6f286dd2a906e1d5fefcc05dfa1";
+    rev = "f3042e30785437f6cb2d99b15625b962fb96799f";
   };
+  nixpkgs-unstable = import nixpkgs-src { config.allowUnfree = true; };
 
   sshPort = 22022;
 
diff --git a/modules/retiolum.nix b/modules/retiolum.nix
index 2917c43..c2e19b0 100644
--- a/modules/retiolum.nix
+++ b/modules/retiolum.nix
@@ -4,7 +4,7 @@ let
   netname = "retiolum";
   cfg = config.networking.retiolum;
 in {
-  imports = [ "${(import <niveum/lib>).nixpkgs-unstable}/nixos/modules/services/networking/tinc.nix" ];
+  imports = [ "${(import <niveum/lib>).nixpkgs-src}/nixos/modules/services/networking/tinc.nix" ];
   disabledModules = [ "services/networking/tinc.nix" ];
 
   options = {
diff --git a/systems/wilde/configuration.nix b/systems/wilde/configuration.nix
index 70fc8b1..1e893bb 100644
--- a/systems/wilde/configuration.nix
+++ b/systems/wilde/configuration.nix
@@ -1,9 +1,6 @@
 { config, pkgs, lib, ... }:
 let
   inherit (import <niveum/lib>) nixpkgs-unstable;
-  unstable = import nixpkgs-unstable {
-    config.allowUnfree = true;
-  };
 in
 {
   imports = [
@@ -39,7 +36,7 @@ in
   nix.buildCores = 1;
   nix.maxJobs = 2;
 
-  environment.systemPackages = [ unstable.minecraft ];
+  environment.systemPackages = [ nixpkgs-unstable.minecraft ];
 
   boot.loader.systemd-boot = {
     enable = true;