diff --git a/hosts/default.nix b/hosts/default.nix
index 12965bc..d493d9a 100644
--- a/hosts/default.nix
+++ b/hosts/default.nix
@@ -12,7 +12,9 @@ in {
   # neodymium laptop
   neodymium = nixpkgs.lib.nixosSystem {
     system = "x86_64-linux";
-    specialArgs = inputs;
+    specialArgs = {
+      inherit inputs;
+    };
     modules = [
       ./neodymium
       inputs.home-manager.nixosModules.home-manager
diff --git a/hosts/hydrogen/system/nix/default.nix b/hosts/hydrogen/system/nix/default.nix
index d5ac7be..35914c0 100644
--- a/hosts/hydrogen/system/nix/default.nix
+++ b/hosts/hydrogen/system/nix/default.nix
@@ -1,7 +1,7 @@
 {
   lib,
   pkgs,
-  nixpkgs,
+  inputs,
   ...
 }: {
   # optimizations
@@ -18,7 +18,7 @@
   nix.settings.experimental-features = ["nix-command" "flakes"];
 
   # pin nixpkgs registry
-  nix.registry.nixpkgs.flake = nixpkgs;
+  nix.registry.nixpkgs.flake = inputs.nixpkgs;
 
   # print diff between two generations
   system.activationScripts.nvd-report-changes = ''
diff --git a/hosts/neodymium/system/nix/default.nix b/hosts/neodymium/system/nix/default.nix
index 066d116..266b91e 100644
--- a/hosts/neodymium/system/nix/default.nix
+++ b/hosts/neodymium/system/nix/default.nix
@@ -1,7 +1,7 @@
 {
   lib,
   pkgs,
-  nixpkgs,
+  inputs,
   ...
 }: {
   # restrict nix command to sudoers
@@ -25,7 +25,7 @@
   };
 
   # pin nixpkgs registry
-  nix.registry.nixpkgs.flake = nixpkgs;
+  nix.registry.nixpkgs.flake = inputs.nixpkgs;
 
   # list of allowed unfree packages
   nixpkgs.config.allowUnfreePredicate = pkg: