try to add a stable nixpkgs overlay

flake.nix

@@ -19,7 +19,6 @@
   outputs = {...} @ inputs: let
     # basic boilerplate-reducing lib with a bunch of functions
     helperLib = import ./helperLib/default.nix {inherit inputs;};
-    stablepkgs = inputs.nixpkgs-stable;
   in
     with helperLib; {
       nixosConfigurations = {

helperLib/default.nix

@@ -1,6 +1,9 @@
 {inputs}: let
   helperLib = (import ./default.nix) {inherit inputs;};
   outputs = inputs.self.outputs;
+  overlay-stable = final: prev: {
+    stable = inputs.nixpkgs-stable.legacyPackages.${prev.system};
+  };
 in rec {
   # ================================================================ #
   # =                            My Lib                            = #
@@ -18,6 +21,7 @@ in rec {
         inherit inputs outputs helperLib;
       };
       modules = [
+        ({ config, pkgs, ... }: { nixpkgs.overlays = [ overlay-stable ]; })
         config
         outputs.nixosModules.default
       ];
@@ -30,6 +34,7 @@ in rec {
         inherit inputs helperLib outputs;
       };
       modules = [
+        ({ config, pkgs, ...}: { nixpkgs.overlays = [ overlay-stable ]; })
         config
         outputs.homeManagerModules.default
       ];

modules/home/bundles/graphicDesign.nix

@@ -3,13 +3,12 @@
   config,
   lib,
   inputs,
-  stablepkgs,
   ...
 }: {
   imports = [];
 
   home.packages = with pkgs; [
-    stablepkgs.inkscape
+    inkscape
     gimp
     krita
   ];