stable?

flake.nix

@@ -24,10 +24,11 @@
       url = "gitlab:rycee/nur-expressions?dir=pkgs/firefox-addons";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    
+
+    nix-flatpak.url = "github:gmodena/nix-flatpak/?ref=latest";
   };
 
-  outputs = { self, darwin, nixpkgs, nixos-hardware, nixos-wsl, home-manager, mac-app-util, ... }@inputs: 
+  outputs = { self, darwin, nixpkgs, nixos-hardware, nixos-wsl, home-manager, mac-app-util, nix-flatpak, ... }@inputs: 
     let
       system = "x86_64-linux";
       pkgs = import nixpkgs {
@@ -63,6 +64,7 @@
         specialArgs = { inherit system; inherit inputs; };
         
         modules = [
+          nix-flatpak.nixosModules.nix-flatpak
           ./caesium.nixos.nix
           {
             nixpkgs.config.allowUnfree = true;